Handbook of High Temperature Superconductor Electronics Part 1 potx

MARCEL
B
Handbook
of
High-Temperature

Superconductor
Electronics
edited
by
Neeraj
Khare
National
Physical Laboratory
New
Delhi,
India
MARCEL
DEKKER, INC.
NEW
YORK
•
BASEL
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Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
APPLIED
PHYSICS
A
Series
of
Professional
Reference

Books
Series Editor
ALLEN
M.
HERMANN
University
of
Colorado
at
Boulder
Boulder,
Colorado
1.
Hydrogenated Amorphous Silicon Alloy Deposition Processes,
Werner
Luft
and Y.
Simon
Tsuo
2.
Thallium-Based High-Temperature Superconductors,
edited
by
Allen
M.
Hermann
and J. V.
Yakhmi
3.
Composite Superconductors,

edited
by
Kozo
Osamura
4.
Organic Conductors Fundamentals
and
Applications,
edited
by
Jean-
Pierre
Farges
5
Handbook
of
Semiconductor
Electrodeposition,
f?.
K.
Pandey,
S. N.
Sahu,
and S.
Chandra
6.
Bismuth-Based High-Temperature Superconductors,
edited
by
Hiroshi

Maeda
and
Kazumasa
Togano
7.
Handbook
of
High-Temperature Superconductor Electronics,
edited
by
Neeraj
Khare
Additional
Volumes
in
Preparation
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
Preface
The discovery of high-temperature superconductors (HTS) exhibiting supercon-
ductivity above liquid nitrogen temperature has led to rapid growth in the devel-
opment of many special-purpose electronics devices that can be broadly grouped
under the umbrella term of “superconductor electronics.”
Superconductor electronics promises particular advantages over conven-
tional electronics: higher speed, less noise, lower power consumption, and much
higher upper-frequency limit. Such characteristics are advantageous in communi-
cation technology, high-precision and high-frequency electronics, magnetic field
measurement, superfast computers, etc. The potential of several superconductor
electronics devices has already been established using low-T
c
conventional super-

conductors. The discovery of cuprate superconductors with higher transition tem-
perature and higher energy gap extends the capability of superconductor electron-
ics considerably. Rapid advancement in the synthesis of HTS thin films and artificial
grain boundary HTS Josephson junctions has elicited considerable interest in the de-
velopment of electronic devices found to be very promising for future applications,
such as superconducting quantum interference devices (SQUIDs) small microwave,
and digital devices. Some of the HTS devices are already on the market.
Advances in the physics and material aspects of HTS have been well docu-
mented in the form of books and monographs, serving as a starting block for gen-
eral readers and beginners. However, the literature was scattered. Thus, this book
is vital, bringing together contributions from leaders in different areas of research
and development in HTS electronics.
The contents are organized to be self-explanatory, comprehensive, and use-
ful to both general reader and specialist. In each chapter care has been taken to
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
iv Preface
introduce basic terminology so that the readers in other fields interested in high-
temperature superconductor electronics will find no difficulty in reading it. Pro-
fessionals will find it an easily available collection of valuable and relevant infor-
mation. The chapters are sequentially organized for use as a text for the study of
high-T
c
devices at the graduate and advanced undergraduate level.
Chapter 1 is an introduction to high-T
c
superconductors, presenting the de-
velopments in the discovery of various HTS compounds, its structure, preparation,
various properties, and comparison to low-T
c
superconductors. The developments

of various techniques for high-T
c
thin-film fabrication are described in Chapter 2.
Readers interested in knowing the advancements in high-T
c
film fabrication will
find it very interesting and informative.
Chapters 3 and 4 present fabrication details and characteristics of multilayer
edge junctions and step-edge junctions in high-T
c
superconducting films.
It is not easy to prepare S/I/S Josephson junctions in high-T
c
as it is usu-
ally done in low-T
c
superconductors (LTS), due to the short coherence length of
HTS. Natural grain boundaries in high-T
c
materials are found to behave as
Josephson junctions. Detailed studies of these grain boundaries have led to the
development of several techniques for realizing artificial grain boundaries and
junctions whose behavior is similar to that of Josephson junctions. Grain bound-
aries in HTS are of central importance in numerous applications, such as elec-
tronic circuits and sensors and SQUIDs. Also, for many experiments elucidating
the physics of high-T
c
superconductivity, grain boundaries have been used with
outstanding success.
Chapter 5 discusses the progress in understanding the conduction noise in

high-T
c
superconductors. Chapter 6 reviews noise mechanisms in HTS junctions,
experimental techniques, and quantitative data on the noise properties of a range
of junctions and devices.
Noise in electronic systems sets limits the sensitivity of devices. Supercon-
ducting devices offer levels of performance that are difficult or impossible to
achieve by conventional methods, but are also subject to limitations due to intrin-
sic noise. A full understanding of the noise mechanism remains one of the out-
standing tasks in the way of successful high-T
c
applications. Intrinsic noise is in
orders of magnitude greater than the limits imposed by quantum mechanics, and
it becomes important to understand the mechanism that causes the excess noise.
In recent years, progress in the development of the high-T
c
SQUID has been
remarkable. It is among the first HTS devices to reach the market. The field sen-
sitivity achieved in HTS SQUIDs is sufficiently high for several applications in-
cluding biomagnetism measurement, nondestructive evaluation, and geophysical
measurement. Progress in high-T
c
rf-SQUIDs and SQUID magnetometer are pre-
sented in Chapters 7 and 8.
Chapter 9 presents an overview of progress in HTS digital circuits. Chapter
10 reviews the progress in the development of several HTS microwave devices
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
Preface v
such as filters, delay lines, low loss resonators, and antennas etc. Chapter 11 de-
scribes the principles and characteristics of high-T

c
IR detectors.
HTS digital circuits are more suitable for use in single-flux quantum (SFQ)
circuits than in LTS ones, because HTS Josephson junctions are naturally over-
damped, which means that their I-V curves do not show hysteresis, and the junc-
tions in SFQ circuits must be overdamped junctions. The I
c
R
n
product of HTS
junctions can also be expected to be larger than that of LTS junctions because it
intrinsically depends on the gap voltage of the superconductor.
For a widespread application of HTS electronics, a package of high-T
c
com-
ponents in closed-cycle cryocoolers is required. Chapter 12 presents advances in the
area of cryocoolers and high-T
c
devices. In order to make this chapter more com-
prehensive for beginners, the principles and details of various closed-cycle methods
such as the Joule-Thomson, Brayton, Claude, Stirling, Gifford-McMahon, and
pulse tube cryocoolers along with their relative merits, are discussed. Finally, the
last Chapter 13 presents a summary of the status and future of HTS electronics.
This book would have never been possible without the support of all the
contributors. I am grateful to all of them for their contributions. In spite of their
own busy schedules and commitments, they spared the time to prepare an ex-
haustive and critical review. The idea of preparing a book on HTS electronics
came after a thought-provoking discussion with Prof. Allen M. Hermann. I am
grateful to him for the enthusiasm he created and for his support during the entire
course of preparation of the book. I am thankful to the publisher, Marcel Dekker,

Inc., for inviting me to edit this book, which indeed proved to be a very interest-
ing and rewarding experience. I am also thankful to my production editor, Brian
Black, for his editorial support.
I have greatly benefited from the experienced advice of Prof. S. Chandra on
several occasions and I am grateful to him for all the encouragement and support.
Encouragement and guidance received from Prof. S. K. Joshi, Dr. K. Lal, Dr.
Praveen Chaudhari, Prof. G. B. Donaldson, Prof. O. N. Srivastava, Prof. E. S. Ra-
jagopal, Prof. A. K. Raychaudhuri, and Dr. A. K. Gupta are gratefully acknowl-
edged. I am thankful to Dr. N. D. Kataria and Dr. Vijay Kumar for their help and
cooperation.
Concern and words of appreciation of Prof. O. P. Malviya have been a great
source of encouragement for me. Emotional support from my well-wishers par-
ticularly came from Priyadarshan Malviya, Pankaj Khare, and Alka Wadhwa. I
wish to express my gratitude to my wife, Sangeeta, for her untiring help, cooper-
ation, and patience, without which it would not have been possible to complete
this book. The smiling face and shining eyes of my little son, Siddharth have been
a great source of stress relief for me and always inspired me to devote more time
to completing the book.
Neeraj Khare
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
Contents
Preface
1 Introduction to High-Temperature Superconductors
Neeraj Khare
2 Epitaxial Growth of Superconducting Cuprate Thin Films
David P. Norton
3 High-Temperature Superconducting Multilayer
Ramp-Edge Junctions
Q. X. Jia
4 Step-Edge Josephson Junctions

F. Lombardi and A. Ya. Tzalenchuk
5 Conductance Noise in High-Temperature Superconductors
László Béla Kish
6 Noise in High-Temperature Superconductor Josephson Junctions
J.C. Macfarlane, L. Hao, and C.M. Pegrum
7 High-Temperature RF SQUIDS
V. I. Shnyrkov
8 High-Temperature SQUID Magnetometer
Neeraj Khare
9 High-Temperature Superconducting Digital Circuits
Mutsuo Hidaka
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
10 High-Temperature Superconductor Microwave Devices
Neeraj Khare
11 High-Temperature Superconducting IR Detectors
John C. Brasunas
12 Cryocoolers and High-T
c
Devices
Ray Radebaugh
13 High-Temperature Superconductor Electronics:
Status and Perspectives
Shoji Tanaka
viii
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
Contributors
John C. Brasunas NASA’s Goddard Space Flight Center, Greenbelt,
Maryland, U.S.A.
L. Hao* Department of Physics and Applied Physics, University of Strathclyde,
Glasgow, Scotland

Mutsuo Hidaka NEC Corporation, Ibaraki, Japan
Q. X. Jia Superconductivity Technology Center, Los Alamos National
Laboratory, Los Alamos, New Mexico, U.S.A.
Neeraj Khare National Physical Laboratory, New Delhi, India
László Béla Kish Texas A&M University, College Station, Texas, U.S.A.
F. Lombardi Chalmers Institute of Technology and Göteborg University,
Göteborg, Sweden
J. C. Macfarlane Department of Physics and Applied Physics, University of
Strathclyde, Glasgow, Scotland
David P. Norton University of Florida, Gainesville, Florida, U.S.A.
C. M. Pegrum Department of Physics and Applied Physics, University of
Strathclyde, Glasgow, Scotland
*Current affiliation: Centre for Basic Metrology, National Physical Laboratory,
Teddington, England
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.
Ray Radebaugh National Institute of Standards and Technology, Boulder,
Colorado, U.S.A.
V. I. Shnyrkov Institute for Low Temperature Physics and Engineering,
Academy of Sciences, Kharkov, Ukraine
Shoji Tanaka Superconductivity Research Laboratory, ISTEC, Tokyo, Japan
A. Ya. Tzalenchuk National Physical Laboratory, Middlesex, England
x Contributors
Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved.