Tài liệu Proceedings of Physical Phenomena at High Magnetic Fields - IV ppt

PPHMF-IV
Proceedings of
Physical Phenomena at
High Magnetic Fields - IV
Editors
G. Boebinger
Z.
Fisk
L. P. Gor'kov
A. Lacerda
J. R. Schrieffer
World Scientific
This page is intentionally left blank
Proceedings of
Physical Phenomena at
High Magnetic Fields - IV
Proceedings of
Physical Phenomena at
High Magnetic Fields - IV
Santa Fe, New Mexico, USA 19-25 October 2001
Editors
G. Boebinger
Los
Alamos National
Laboratory,
New
Mexico,
USA
Z.
Fisk
National High Magnetic

Field
Laboratory,
Florida
State University, USA
L. P. Gor'kov
National High Magnetic
Field
Laboratory,
Florida
State University, USA
A. Lacerda
Los
Alamos National
Laboratory,
New
Mexico,
USA
J. R. Schrieffer
National High Magnetic
Field
Laboratory,
Florida
State University, USA
0 World Scientific
m Singapore • New Jersey • London • Hong Kong
Published by
World Scientific Publishing Co. Pte. Ltd.
P O Box 128, Farrer Road, Singapore 912805
USA office: Suite IB, 1060 Main Street, River Edge, NJ 07661
UK office: 57 Shelton Street, Covent Garden, London WC2H 9HE

British Library Cataloguing-in-Publication Data
A catalogue record for this book is available from the British Library.
PHYSICAL PHENOMENA AT HIGH MAGNETIC FIELDS-IV
Copyright © 2002 by World Scientific Publishing Co. Pte. Ltd.
All rights
reserved.
This
book,
or parts
thereof,
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without written permission from the Publisher.
For photocopying of material in this volume, please pay a copying fee through the Copyright
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ISBN 981-02-4896-2
Printed in Singapore.
PREFACE
Physical Phenomena at High Magnetic Fields-IV (PPHMF-IV) was the fourth
conference sponsored by the National High Magnetic Field Laboratory (NHMFL).
The previous conferences were held in May, 1991, 1995, and 1998. These meetings
brought together experts in scientific research areas where high magnetic fields
could make an important impact.
PPHMF-III devoted substantial time to reviewing the state of many fields in
regard to the role of high magnetic fields, such as semiconductors, heavy fermions,
superconductivity, and molecular conductors. Since these topics have been
thoroughly examined in PPHMF-III, it was felt that the present conference should

be devoted to recent developments in these fields.
The conference which took place in October, 2001, at Santa Fe Convention
Center in Santa Fe, NM, was organized with invited lectures in the morning and late
afternoon and poster sessions in the early afternoon. This schedule permitted
extensive discussion with the poster contributors and was judged to be an effective
format by the 150 participants in attendance.
As in the past conferences, World Scientific was chosen to be the publisher of
the proceedings because of their excellent handling of the prior proceedings.
The editors of these proceedings are pleased to acknowledge their gratitude to
the many who worked so hard to bring about this most successful conference. We
wish to thank the staff of the NHMFL, especially Wally Thorner of the NHMFL
Educational Media Department, LeeRoy Herrera, Marion Hutton, Lou Miller and
Alice Hobbs for taking care of the correspondence and travel arrangements. We
would also like to warmly thank Julie Gallegos and Mary Layne, for their
outstanding help in organizing this conference, and handling the production issues
of these proceedings
Finally, our heartfelt thanks to those who put behind them the fears and
concerns of the September
11,
2001 events and boarded plans, trains, cars and made
the PPHMF-IV conference a tremendous success.
v
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CONTENTS
Preface
Part I Semiconductors/QHE
Quantum Hall Effect in AlAs 2D Electron Systems 3
E. P. De Poortere, E. Tutuc,
Y.
P. Shkolnikov, K.

Vakili,
M. Shayegan,
E. Palm and
T.
Murphy
Tunneling in a Quantum Hall Excitonic Condensate* 9
J. P. Eisenstein, I. B. Spielman, L. N. Pfeiffer and
K.
W. West
Quantum Hall Liquid Crystals 10
M. M. Fogler
Ultrafast Manipulation of Electron Spin Coherence in Quantum Wells 16
J. A. Gupta, D. D. Awschalom, R. Knobel
andN.
Samarth
Zero-Bias Conductance Anomaly in Bilayer Quantum Hall Systems 22
Y.
N. Joglekar and
A.
H. MacDonald
Some Fractions are more Special than Others: News from the Fractional
Quantum Hall Zone 26
W.
Pan, H. L. Stormer, D. C. Tsui, L. N. Pfeiffer, K.
W.
Baldwin
andK.
W. West
Possible New Phases of Composite Fermions 32
V.

W.
Scarola, S.
Y.
Lee and J. K. Jain
Intersubband Magnetophonon Resonances in Quantum Cascade Structures 38
D.
Smirnov, O. Drachenko, J. Leotin, H. Page, C. Becker, C. Sirtori,
V.
Apalkov and
T.
Chakraborty
Interference and Decoherence of Composite Fermions in the Quantum
Hall Effect* 42
A.
Stern
* Abstract only
VII
VIII
Current-Driven Magnons in Magnetic Multilayers* 43
M. Tsoi
Contributed Papers
Theory of Surface-Acoustic-Wave Propagation in the v= 5/2 Fractional
Quantum Hall State* 47
K. C. Foster, N. E. Bonesteel
andS.
H. Simon
High Magnetic Field Dependent Diamagnetic Shifts in Al
x
Ga,.
x

As
Semiconductor Alloys 48
E. D. Jones, J. L. Reno, S. Crooker, K. K. Bajaj and
G.
Coli
Effect of Strong Terahertz Radiation on Magnetoconductivity in
Two-Dimensions 52
R.
A. Lewis,
W.
Xu, P. M. Koenraad and I.
V.
Bradley
Tunneling Zero-Bias Anomaly in the Ultra-Quantum Limit 56
D.
L. Maslov, S. -W. Tsai andL. I. Glazman
High Magnetic Field Optical Studies of Charged Exciton in CdTe 2D
Electron Gases* 60
N. Negre, S. A. Crooker, A.
Wojs
and
G.
Karczewski
Increase of Quantum Hall Plateau Widths due to Electron-Phonon Interaction 61
J. Riess, T. Duguet, P. Magyar and
D.
Bicout
Search for Superluminal Propagation in High Magnetic Fields 65
J. Riess
Impurities in a Magnetic-Field-Induced Luttinger Liquid 69

S W. Tsai, D. L. Maslov andL. I. Glazman
Reconstruction of Fractional Quantum Hall Edges* 73
X.
Wan,
K. Yang and
E.
H. Rezayi
Sample Cooling and Rotation at Ultra-Low Temperatures and High
Magnetic Fields 74
J. S. Xia, E. D. Adams, N. S. Sullivan,
W.
Pan, H. L. Stormer
andD, C. Tsui
* Abstract only
IX
Part II Heavy Fermions
Does the Heavy Electron Maintain its Integrity at Quantum Critical
Point?*
81
P.
Coleman
Observation of
a
Second Energy Scale in YbAl
3
above 40 T 82
A.
L. Cornelius,
T.
Ebihara, J. M. Lawrence, P. S. Riseborough

and J. D. Thompson
High Pressure Transport Study of Non-Fermi Liquid Behaviour in U
2
Pt
2
In
and U
3
Ni
3
Sn
4
88
A.
de
Visser,
P. Estrela and
T.
Naka
The de Haas-van Alphen Effect in CeMIn
5
(where M = Rh and Co) 94
D.
Hall. T. P. Murphy. E. C. Palm, S. W. Tozer, Z.
Fisk,
N. Harrison,
R.
G. Goodrich,
U.
Alver and J. L. Sarrao

Superconducting and Normal State Properties of the Heavy Fermion
Compound PrOs
4
Sbi
2
98
P C. Ho,
V.
S.
Zapf,
E.
D. Bauer, N. A. Frederick, M. B. Maple,
G. Giester, P. Rogl, S.
T.
Berger, C. H. Paul and
E.
Bauer
Specific Heat Anomaly for H > 28.5 T in Celrln
5
104
J. S. Kim, J.
Alwood,
P. Kumar andG. R. Stewart
Thermodyanamic Studies of the Field-Induced Gap in the
Quasi-One-Dimensional S = 1/2 Antiferromagnet Yb
4
As
3
108
M. Lang, S. Zherlitsyn, B.

Wolf,
H. Aoki, T. Cichorek,
P.
Gegenwart, B. Schmidt, F. Steglich and
A.
Ochiai
Two-Component Superconductivity of Heavy Fermionic Material UPt
3
* 114
V.
P. Mineev and
T.
Champel
CeMIn
5
(M = Co, Ir, Rh) Heavy Fermion Superconductors and the
Utility of High Magnetic Fields 115
J. L. Sarrao
* Abstract only
Quantum Critical Fluctuations in Heavy Fermion Compounds 121
A.
Schroeder, G. Aeppli, P. Coleman, R. Ramazashvili,
R.
Coldea, M. Adams, E. Bucher, D. F. McMorrow,
H.
V.
Lohneysen and
O.
Stockert
Ultrasonic Measurements at the Metamagnetic Transition in URu

2
Si
2
127
A.
Suslov, D. Dasgupta, J. R. Feller, B. K. Sarma, J. B. Ketterson,
D.
G. Hinks, M. Jaime, F, Balakirev, A. Migliori and
A.
Lacerda
Contributed Papers
High Field Magnetization, Longitudinal and Transverse Magnetoresistance
ofUirGe 133
S. Chang, H. Nakotte, A. M. Alsmadi, A. H. Lacerda, M. H. Jung,
M. Mihalik, K. Prokes, J. C. P. Klaasse, E. Brtick
andF.
R. De Boer
High Field Magnetotransport in CeRh!.
x
Ir
x
In
5
Heavy Electron Alloys 137
A.
D. Christianson, A. H. Lacerda, P. G. Pagliuso, N. O. Moreno,
M. F. Hundley and J. L. Sarrao
dHvA Measurements on Lai_
x
Ce

x
MIn
5
where M = Rh, Ir, and Co* 141
R.
G. Goodrich,
U.
Alver, N. Harrison, J. L. Sarrao, D. Hall
andZ.
Fisk
Anisotropic Properties of Single-Crystalline CeNiGe
2
142
M. H. Jung, N. Harrison, A. H. Lacerda, P. G. Pagliuso, J. L. Sarrao
and J. D. Thompson
"High-Temperature" Oscillations of Bismuth Conductivity in the
Ultra-Quantum Limit 146
V.
B. Krasovitsky
High-Field Magnetization in the Mott-Hubbard System (Y, Ca)V0
3
150
H. Nakotte, A. M. Alsmadi, H. Kawanaka, K. Kindo
andK.
Goto
Inelastic Neutron Scattering from Anisotropic Superconductors 154
P.
S. Riseborough
Ultrasonic and Magnetization Studies at the Metamagnetic Transition in UPt
3

158
A.
Suslov, D. Dasgupta, J. R. Feller, B. K. Sarma, J. B. Ketterson
and
D.
G. Hinks
* Abstract only
XI
Part III Molecular Conductors
Magnetic-Field-Induced Superconductivity in Layered Organic Molecular
Crystals with Localized Magnetic Moments* 165
O. Cepas, R. H. McKenzie and J. Merino
Persistent Currents at Fields above 23 T 166
N. Harrison
High-Magnetic-Field Tests for Reduced Dimensionality in Organic
Superconductors: Just how Valid are the Mott-Ioffe-Regel and
Anderson Criteria? 172
J. Singleton, P. A.
Goddard,
A. Ardavan, N. Harrison. S. J. Blundell,
J. A. Schlueter and
A.
M. Kini
Magnetic Phase Diagram in Field Induced Superconductors
X-(BETS)
2
Fe
x
Ga,.
x

Cl
4
178
S. Uji, C. Terakura, T. Terashima, T. Yakabe,
Y.
Imanaka, Y. Terai,
S. Yasuzuka, M. Tokumoto, A. Kobayashi, F. Sakai, H. Tanaka,
H. Kobayashi, L. Balicas and J. S. Brooks
The Quantum Hall Effect in Quasi-One-Dimensional Organic Conductors* 183
V.
M. Yakovenko
NMR Study of the Antiferromagnetic to Superconductor Phase
Transition in (TMTSF)
2
PF
6
184
W. Yu, S. E. Brown, F. Zamborszky, I. J. Lee and
P.
M. Chaikin
Contributed Papers
The Effects of Pressure and Magnetic Field on the Conductivity of FeCI
4
Doped Poly acetylene: The Influence of Scattering by Low-Energy
Excitations 193
A.
N. Aleshin,
T.
J. Kim, D S. Suh, Y.
W.

Park,
H. Kangand
W.
Kang
High Field Phase Diagram of the Field-Induced Superconducting State
ofMBETS)
2
FeCl
4
197
L.
Balicas, J. S. Brooks, K. Storr, S.
Uji,
M. Tokumoto, H. Tanaka,
H. Kobayashi, A. Kobayashi,
V.
Barzykin and
L.
P. Gor'kov
* Abstract only
XII
Magnetic Field-Induced Density Wave Transition in a x-phase Organic
conductor 201
D.
Graf,
L. Balicas, J. S. Brooks, C. Mielke and
G.
C. Papavassiliou
Electron Magnetic Resonance Fermi Surface Imaging: Applications to
Organic Conductors and Sr

2
Ru0
4
205
5.
Hill,
A. Kovalev, M. M. Mola, C. Palassis, Z. Q. Mao,
Y.
Maeno
and
J.
S. Quails
High Field Magnetoconductivity of Iodine Doped Helical Polyacetylene 209
D S. Suh,
T.
J. Kim, A. N. Aleshin, Y.
W.
Park,
G. Piao, K. Akagi,
H. Shirakawa, J. S. Quails, S.
Y.
Han and
J.
S. Brooks
Part IV Quantum Solids and Liquids
Viscosity of Highly Polarized very Dilute
3
He -
4
He Mixtures 215

H. Akimoto, J. S. Xia, E. D. Adams, D. Candela,
W.
J. Mullin
andN.
S. Sullivan
Contributed Papers
Investigation of Multiple-Spin Exchange in 2D Films of
3
He:
NMR Studies 223
C. Parks, N. S. Sullivan and
P.
Stachowiak
Order/Disorder Transitions of Ortho-Para Hydrogen Monolayers at Low
Temperatures 227
TV.
S. Sullivan, K. Kim and
V.
B. Kokshenev
Part V Superconductivity
Magnetotransport in Cuprates and Related Compounds in High Magnetic
Fields: Evidence for Preformed Bipolarons* 233
A.
S. Alexandrov
Spinless Impurities in Cuprates: Local Magnetism and Kondo Effect
in the Normal and Superconducting States* 234
H. Alloul, J.
Bobroff,
P.
Mendels and

F.
Rullier-Albenque
* Abstract only
Magnetic Field and Impurity Effects in Pseudogap State of
Cuprates*
235
A.
V.
Balatsky
The Fascinating New Physics of Some Old BCS Superconductors 236
V.
Barzykin
Orbital Magnetism in the Cuprates 242
S. Chakravarty, H Y. Kee
andC.
Nayak
Magnetism and Superconductivity in YBa
2
Cu
3
0
6+x
Superconductors* 249
P.
Dai, H. A.
Mook,
S. M. Hay
den,
A. Hiess, S H. Lee
andF.

Dogan
Far-Infrared Hall Effect in Normal State of YBCO* 250
M. Grayson, L. Rigal, D. C. Schmadel, H. D. Drew and P J. Kung
Pseudogap State of High T
c
Cuprates: A Predominant Role of Spin
Degrees of Freedom 2 51
L.
Krusin-Elbaum,
T.
Shibauchi, M. P. Maley, M. Li and
P.
H. Kes
Vortex Magnetism in the High-Temperatures Superconductor
La
2
.
x
Sr
x
Cu0
4
* 257
B.
Lake,
T.
E. Mason, G. Aeppli, K. Lefmann, N. B. Christianson,
D.
F. McMorrow, K. N. Clausen, H. M. Ronnow, P. Vorderwisch,
P.

Smeibidl, N. Magnkorntong, N. E. Hussey,
T.
Sasagawa,
M. Nohara, H. Takagi and
A.
Schroder
Magnetic Field Tuning of Charge and Spin Order in the Cuprate
Superconductors 258
A.
Polkovnikov, S. Sachdev, M. Vojta and
E.
Demler
Anomalous Behavior of Spin Fluctuations in Polycrystalline NdBa
2
Cu
3
0
7
266
A.
P. Reyes, M. Abdelrazek, P. L. Kuhns, W. G. Moult
on,
W.
P. Halperin and
K.
Kishio
Contributed Papers
Low-Temperature Normal-State Hall Effect in High-T
c
Bi2Sr

2
.
x
La
x
Cu0
6
+8 Revealed by 60 T Magnetic Fields 275
F. F. Balakirev, J. B. Betts, G. S. Boebinger, S. Ono,
Y.
Ando
and
T.
Murayama
* Abstract only
XIV
Tunneling Spectroscopy of the Electron-Doped Cuprate Superconductor
Pr
2
.xCe
x
Cu0
4
* 279
A.
Biswas, P. Fournier,
V.
N. Smolyaninova, H.
Bald,
J. S. Higgins,

A.
R. C. Budhani andR. L. Greene
Magnetic Field Effects on T
c
and the Pseudogap Onset Temperature in
Cuprate Superconductors 280
Q. Chen, Y J. Kao, A. P. Iyengar
andK.
Levin
Specific Heat of Mg
n
B
2
in Magnetic Fields: Two Energy Gaps in the
Superconducting State 284
R.
A. Fisher, F. Bouquet, N. E. Phillips, D. G. Hinks
and J. D. Jorgensen
Mixing of Singlet and Triplet Pairing for Surface Superconductivity* 288
L.
P. Gor'kov andE. I. Rashba
Mg as a Main Source for the Diverse Magnetotransport Properties
ofMgB
2
289
K. H. Kim, J. B. Betts, M. Jaime, A. H. Lacerda, G. S. Boebinger,
C.
U.
Jung, H J. Kim, M.S. Kim, J. Y Kim, Z. Du
andS I.

Lee
Anomalous Re-entrant Superconductivity in Sr
0
.4K
0
.6BiO
3
: Recovery of
Superconductivity with Electric and Magnetic Field 293
D.
C. Kim, J. S. Kim, A. N. Baranov, Y.
W.
Park,
J. S. Pshirkov
and
E.
V.
Antipov
The Inhomogeneous Magnetic Fluctuations in the Superconducting
La
2
.xSr
x
Cu0
4
297
P.
L. Kuhns, A. P. Reyes, W. G. Moulton, E. F. Kukovitskii,
E. L. Vavilova andG. B. Teitel'baum
Field-Induced Antiferromagnetism in the High-Temperature

Superconductor La
2
.
x
Sr
x
Cu04* 301
B.
Lake,
T.
E. Mason, G. Aeppli, K. Lefmann, N. B. Christensen,
D.
F. McMorrow, K. N. Clausen, H. M. Ronnow, P. Vorderwisch,
P.
Smeibidl, N. Mangkorntong N. E. Hussey,
T.
Sasagawa,
M. Nohara, H. Takagi and
A.
Schroder
Abstract only
XV
Magnetic Tests to Reveal Triplet Superconductivity in (TMTSF)
2
PF
6
and a Possible Breaking of
a
Time Reversal Symmetry in Sr
2

Ru0
4
,
LBCO, and YBCO* 302
A.
G. Lebed
Metal-Insultator Crossover in high T
c
Cuprates: Gauge Field Theory
Versus Experiments 303
P.
A. Marchetti, Z B. Su andL. Yu
Using Radio Frequency Penetration Depth to Probe Layered
Superconductors 307
C. H. Mielke
Influence of Electron Irradiation Defects on the Transport Properties
of
Cuprates*
311
F. Rullier-Albenque, R. Tourbot and
H.
Alloul
Interplay between Spin and Crystal Lattices in Antiferromagnetic
YBa
2
Cu
3
0
6
.25 312

V.
Sandu, E. Cimpoiasu, C. C. Almasan, A. P. Paulikas
andB. W. Veal
Magnetotransport and the Magnetic Phase Diagram of Superconducting
ErNi
2
B
2
C 316
G. M.
Schmiedeshoff,
S. Touton,
W.
P. Beyermann, A. H. Lacerda,
S. L. Bud'ko and
P.
C. Canfield
High-Field Transport Properties of
T
'-Ln
2
.
x
Ce
x
Cu0
4
(Ln = Nd, Pr, La) 320
T. Sekitani, N. Miura
andM.

Naito
Percolative Superconductivity in
Mgi_
x
B
2
*
324
P.
A. Sharma
Vortex Glass Transition Versus Irreversibility Line in
Superconducting BKBO* 325
P.
Szabo, P. Samuely, J. Kacmarcik,
T.
Klein, A. G. M. Jansen,
A.
Morello and J. Marcus
* Abstract only
XVI
Transport in MgB
2
in High Magnetic Fields* 326
P.
Szabo, P. Samuely,
A.G.M.
J arisen,
T.
Klein, J. Marcus,
D.

Fruchart
andS.
Miraglia
Evidence for the Pair Formation far above T
c
in Epitaxial La
2
.
x
Sr
x
Cu0
4
Thin Films 327
J.
Vanacken,
L. Weckhuysen, P. Wagner and
V. V.
Moshchalkov
Part VI Magnetism and Magnetic Phenomena
Resistivity and Penetration Depth Measurements of Organic Superconductors
in High Magnetic Fields using a Tunnel Diode Oscillator 333
C. C. Agosta, T. Coffey, Z. Bayindir, I. Mihut, C. Martin and
M. Tokumoto
Theoretical Overview of Superconductivity in Strontium Ruthenate 339
D.
F. Agterberg
The Millimetre-Wave Magneto-Optical Response of Sr
2
Ru0

4
344
A.
Ardavan, E. Rzepniewski, R. S. Edwards, J. Singleton
and
Y.
Maeno
Magnetic Properties of Heavy Fermion Superconductors
CeRhIn
5
andCe
2
RhIn8 350
W.
Bao, G. Aeppli, A. D. Christianson, Z.
Fisk,
M. F. Hundley,
A.
H. Lacerda, J.
W.
Lynn, P. G. Pagliuso, J. L. Sarrao and
J. D. Thompson
Spin Correlations in Magnetized Haldane Chains* 356
C. L. Broholm
Quantum Oscillations, Tunneling Magnetoresistance and Angular
Dependence of Magnetization in Ca
3
Ru
2
0

7
* 357
G. Cao
Spin Density Wave Order and Fluctuations in (TMTSF)
2
PF
6
at very
High Magnetic Fields 358
W. G.
Clark,
P.
Vonlanthen,
A. Goto, K. B. Tanaka, B. Alavi,
W. G. Moulton, A. P. Reyes and
P.
Kuhns
* Abstract only
XVII
A Metamagnetic Quantum Critical Endpoint in the Sr
3
Ru
2
0
7
364
S. A. Grigera, A. P. Mackenzie, A. J.
Schofield,
S. R. Julian
and

G.
G. Lonzarich
High Field NMR in Strongly Correlated Low-Dimensional
Fermionic Systems 371
M. Horvatic and
C.
Berthier
Triplet Superconductivity Order Parameter in an Organic Superconductor
(TMTSF)
2
PF
6
* 377
A.
G. Lebed
Magnetism at the Spatial Limit* 378
H. Manoharan
Ferromagnetic and Structural Instabilities in Ca
2
.xSr
x
Ru0
4
379
S. Nakatsuji and
Y.
Maeno
Effects of Parallel Magnetic Fields on the Unusual Metallic Behavior in
Two Dimensions* 385
D.

Popovic
Geometrical Frustration, and Relevance for High Field Studies* 386
A.
P. Ramirez
Contributed Papers
Effects of In-Plane Strain on Magnetism in LaMn0
3
Thin Films 389
K. H. Ahn and
A.
J. Millis
Observation of Quantum Oscillations in Four-Layer BaRu0
3
393
C. S. Alexander,
Y.
Xin, Z. X. Zhou, S. McCall, G. Cao
and
J.
E. Crow
Hopping Conductivity in One-Dimensional Ca
3
Co
2
0
6
Single Crystal 397
J. M. Broto, B. Raquet, H. Rakoto, B. N. Baibich, S. Lambert and
A.
Maignan

* Abstract only
XVIII
Colossal Effects in Transition Metal Oxides Caused by Intrinsic
Inhomogeneities* 401
J. Burgy, M. Mayr,
V.
Martin-Mayor, A. Moreo andE. Dagotto
55
Mn NMR and Magnetization Studies of La
x
Sri_
x
Mn0
3
402
T. Caldwell, P. L. Kuhns,
W.
G. Moulton and
A.
P. Reyes
High Field NMR Studies of
NaV
2
0
5
to 44.7 T 406
T. Caldwell, P. L. Kuhns,
W.
G. Moulton, A. P. Reyes, P. N. Rogers
and

R.
N. Shelton
Triplet Modes in a Quantum Spin Liquid across the Critical Field 410
N. Cavadini, Ch. Riiegg, A. Furrer, H. U. Gtidel, K. Kramer,
H. Mutka, A.
Wildes,
K. Habicht and
P.
Vorderwisch
Crystal-Field Effects in the First-Order Valence Transition in YblnCu
4
Induced by External Magnetic Field* 414
M. Dzero
Tamm-Type of States at the Interface in Lai_
x
Sr
x
Mn03 (x=0.4, 0.55)
Superlattices 415
M. Dzero andL. P. Gor'kov
Magnetic Resonances Observed in the High-Field Magneto-Optical
Absorption of the Quantum Ising Ferromagnet LiHoF
4
420
R.
S. Edwards, A. Narduzzo, E. Lyons, L. Childress, S. J. Blundell,
J. Singleton andR. C C. Ward
Large Effects of Magnetic Field on Josephson Currents Through
Antiferromagnetic Barriers* 424
L.

P. Gor
'kov
and
V.
Z. Kresin
Pressure Dependent Magnetization and Magnetic Ordering in Rare
Earth Ruthenates, Sm
2
Ru0
5
, Gd
2
Ru0
5
, Tb
2
Ru0
5
and Nd
3
RuO
?
425
R.
P. Guertin
andS.
McCall
Dynamical Properties of Field-Induced Ordered-States in S = 1/2
One-Dimensional Quantum Spin Systems 429
N. Haga

andS I.
Suga
* Abstract only
Dynamical Structure Factors of the S = 1/2 Spin Ladder Systems with a
Diagonal Interaction in the Magnetization-Plateau State* 433
N. Haga
andS.
Suga
D-Strain, G-Strain, and Dipolar Interactions in the Fe
8
and Mn
I2
Single
Molecule Magnets: An EPR Lineshape Analysis 434
S.
Hill,
S. Maccagnano, R Achey, N. Dalai
andK.
Park
High Pressure Apparatus for Transport Properties Study in High
Magnetic Field 438
F. Honda,
V.
Sechovsky, O. Mikulina, J.
Kamarad,
A. M. Alsmadi,
H. Nakotte and
A.
H. Lacerda
High-Field Hall Effect and Band Structure of Half-Metallic Cr0

2
Films 442
S. M.
Watts,
S.
Von
Molndr
andM.
Jaime
Phase Transitions in Insulating Vanadium Oxide* 446
A.
Joshi, M. Ma
andF.
C. Zhang
Magnetization Curves of Quasi-One-Dimensional Haldane Systems 447
A.
Kawaguchi, A. Koga, N. Kawakami
andK.
Okunishi
Negative Magnetoresistance in PbTe(Mn,Cr) 451
D.
Khokhlov, I. Ivanchik, A. Kozhanov, A. Morozov, E. Slynko,
V.
Slynko,
W.
Dobrowolski and
T.
Story
New Non-Cooperative Quantum Phenomenon in a Ferrimagnet with
Antiferromagnetic Impurity 455

A.
S. Lagutin, A. Semeno, J. Vanacken and
Y.
Bruynseraede
Ferromagnetic Resonances in Polycrystalline Lao.8Lio.2Mn0
3
459
R.
A. Lewis, X. L. Wang, S. X. Dou, N. Biskup and J. S. Brooks
The Study of the Magnetic Breakdown Effect as a Function of Angle
in the Organic Conductor K-(BEDT-TTF)
2
Cu(NCS)
2
in High
Magnetic Fields 463
/. Mihut, C. C. Agosta, C. H. Mielke
andM.
Tokomoto
* Abstract only
XX
Electronic Scattering and Spin Disorder in 3d-Ferromagnets in the
Paraprocess Regime 468
B.
Raquet, J. M. Broto, M.
Viret,
E. Sondergard and
O.
Cespedes
Raman Scattering Study of Temperature-and Field-Dependent Magnetic

Polaron Formation in (Eu,Gd)0 472
H. Rho, C S. Snow, S. L. Cooper, Z.
Fisk,
A. Comment and
J-Ph.
Ansermet
Nuclear Magnetism of
Helium-3
Precipitates* 476
V.
A. Shvarts, K. J. Kless, N. Matsunaga, E. D. Adams, J. X. Xia
and
E.
A. Schuberth
Pulse-Field Experiments on the Spin-Lattice Interaction in Low-Dimensional
Spin Systems 477
B.
Wolf,
S. Zherlitsyn, S. Schmidt, B. Luthi
andM.
Lang
Electron-Spin Resonance Evidence of the Quantum Spin Gap in the LiCu
2
0
2
481
S. A. Zvyagin, G. Cao, L C. Brunei and J. Crow
Part VII Other Aspects of Studies in High Magnetic Fields
Electron Correlation Effects in Biological Molecules* 487
D.

L. Cox, R. Endres, R.
V.
Kulkarni, M. Labute andR. R. P. Singh
Force-Detected Scanned Probe Magnetic Resonance Microscopy* 488
P.
C. Hammel
Advances in Megagauss Field Generation and Application at ISSP 489
N. Miura, Y. H. Matsuda, K. Uchida, S. Ikeda and
F.
Herlach
Contributed Papers
Ultrafast Coherent Terahertz Spectroscopy in High Magnetic Fields 497
S. A. Crooker and
A.
J. Taylor
Recent Advances in Low Temperature Thermometry in High
Magnetic Fields* 501
E. C. Palm, T. P. Murphy, S. W. Tozer and
S.
T.
Hannahs
* Abstract only
XXI
Neutron Scattering in Magnetic Fields up to 17 T* 502
K. Prokes, P. Smeibidl and
M.
Meissner
Ultrasonic Spectrometers for Condensed Matter Studies at very High
Magnetic Fields 503
A.

Suslov, D. Dasgupta, J. R. Feller, B. K. Sarma and J. B. Ketterson
High Pressure Techniques for Low Temperature Studies in DC and
Pulsed Magnetic Fields* 507
S. W. Tozer
Part VIII Instrumentation and Facility Development of High
Magnetic Fields
The Dresden 100 T/10 ms Project: A High Magnetic Field Facility at
anIR-FEL* 511
M. Dorr, D. Eckert, H. Eschrig, F. Fischer, P. Fulde,
R.
Groessinger, W. Griinberger, A. Handstein, D. Hinz, R. Kratz,
H. Krug, M. Loewenhaupt, K H. Miiller, F. Pobeli, L. Schultz,
H. Siegel, F. Steglich and
P.
Verges
Development of Advanced Instrumentation for Static and Pulsed Fields* 512
A.
Migliori, F. F. Balakirev, J. B. Betts, G. S. Boebinger,
C. H. Mielke and
D.
Rickel
Megagauss Cyclotron Resonance in Semiconductor Nanostructures and
Diluted Magnetic Semiconductors 513
N. Miura, Y. H. Matsuda and
T.
Ikaida
Feasibility Studies for the Implementation of Nuclear Magnetic Resonance
in a 25 T Hybrid Magnet* 519
P.
J. M. van Bentum, J. C. Maan,

J.W.M.
van Os and
A.
P. M. Kentgens
*
Abstract only
Parti
Semiconductors/QHE
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QUANTUM HALL EFFECT IN AlAs 2D ELECTRON SYSTEMS
E.
P. DE
POORTERE,
E.
TUTUC,
Y. P.
SHKOLNIKOV,
K.
VAKILI and M. SHAYEGAN
Department of Electrical Engineering, Princeton University, Princeton,
NJ
08544
E. PALM and T. MURPHY
National High Magnetic Field Laboratory, Tallahassee,
FL
32310
We report
on
fabrication
of

two-dimensional electrons
in
AlAs quantum wells with
mobilities up to
31
m
2
/Vs. Magnetoresistance measurements reveal fractional quantum Hall
states
at
high-order filling factors, and up
to v
=
11/3. Shubnikov-de Haas oscillations
of
high-density samples suggest that electrons occupy
two
X-point valleys.
We
also study
properties
of
hysteretic resistance spikes occurring
at
transitions between quantum Hall
ferromagnets in AlAs quantum wells, and show that the spike hysteresis depends sensitively
on the number of occupied energy levels involved in the transition.
1 Introduction
Although a great deal of work has been done on two-dimensional electron systems
(2DESs) in GaAs quantum wells, little attention has been given to the electronic

properties of clean 2DESs confined to AlAs quantum wells. In the vast majority of
GaAs/AlAs structures, the electrons are confined in the GaAs while AlAs, or more
commonly AlGaAs, is used as the barrier material. The electrons in this case
occupy the conduction band minimum at the T-point of the Brillouin zone (see Fig.
1
A
GaAs
AlAs
/^
r*
120
A
GaAs
200
A
AlGaAs
5x10"
cm
2
Si
AlGaAs
C Energy (meV)
0
500 1000 1500
0
500
750
A
AlGaAs
^

12 -2
o: •<.
110 A AlAs £
£ 1000
1500
2000
I
~\
I
I
Figure 1: (A) Fermi surfaces
of
conduction electrons
in
GaAs and AlAs. (B) Schematic cross-section and
(C) conduction band diagram
of
the AlAs quantum well.
In
(C), X-point and T-point conduction band
edges are indicated by solid and dashed lines, respectively.
3