Fluctuation Phenomena in High Temperature Superconductors

435 Pages·1997·25.47 MB·English

by  A. A. Varlamov

Fluctuation Phenomena in
High Temperature Superconductors
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3. High Technology - Vol. 32
Fluctuation Phenomena in
High Temperature
Superconductors
edited by
Marcel Ausloos
SUPRAS, Institute of Physics,
University of Lidge,
Liäge, Belgium
and
Andrei A. Varlamov
"Forum": INFN Laboratory for the Theory of Condensed Matter,
Department of Physics,
University of Florence,
Florence, Italy
Springer-Science+Business Media, B.V.
Proceedings of the NATO Advanced Research Workshop on
Fluctuation Phenomena in High Critical Temperature Superconducting Ceramics
Trieste, Italy
5—9 August, 1996
A CLP. Catalogue record for this book is available from the Library of Congress.
ISBN 978-94-010-6331-9 ISBN 978-94-011-5536-6 (eBook)
DOI 10.1007/978-94-011-5536-6
Printed on acid-free paper
All Rights Reserved
© 1997 Springer Science+Business Media Dordrecht
Originally published by Kluwer Academic Publishers in 1997
Softcover reprint of the hardcover 1st edition 1997
No part of the material protected by this copyright notice may be reproduced or
utilized in any form or by any means, electronic or mechanical, including photo
copying, recording or by any information storage and retrieval system, without written
permission from the copyright owner.
TABLE OF CONTENTS
PREFACE ix
PART I. Near the Ginzburg-Landau Temperature 1
A. A. Varlamov and M. Ausloos, Fluctuation phenomena in superconductors 3
o.
Rapp, J. Axn1ls, Yu. Eltsev and W. Holm, C-axis transport
in YBa2Cu307_B 43
T. Plackowski, Analysis of the specific heat jump at Tc for
53
5mB~Cu3~_B
S. K. Patapis, Fluctuation conductivity in a-b plane and along c-axis
in films of YBaCuO 61
D. V. Livanov, Fluctuation thermoelectric effect above the
superconducting transition 73
W. Lang, G. Heine, W. Liebich, X. L. Wang and X. Z. Wang,
Magnetoresistance in HTSC far above Tc : fluctuations versus
normal-state contributions 81
P. Konsin, B. Sorkin and M. Ausloos, Electric field effects in high-Tc
superconductors 91
M. Houssa, H. Bougrine and M. Ausloos, Effect of fluctuations on the
thermal conductivity of High-Tc superconductors 101
I. G. Gorlova, S. G. Zybtsev, V. Va. Pokrovskii and V. N. Timofeev,
Fluctuation phenomena in BSCCO (2212) whiskers 113
VI
F. Federici and A. A. Varlamov, The fluctuation induced pseudogap in the
infrared optical conductivity of high temperature superconductors 121
A. Carrington, F. Bouquet, C. Marcenat, D. Colson, V. Viallet and A. Tyler,
Specific heat studies oflow dimensional high-Tc superconductors 131
P. Carretta, A. Rigamonti, A. A. Varlamov and D. Livanov,
d-pairing in high temperature superconductors: pro and contra from the
fluctuation phenomena analysis 141
J. Booth, Dong-Ho Wu and S. M. Anlage, Measurements of the frequency
dependent microwave fluctuation conductivity of cuprate thin film
superconductors 151
A. Barone and A. A. Varlamov, Fluctuation phenomena in tunnel
and Josephson junctions 179
G. Balestrino, E. Milani and A. A. Varlamov, The role of density of
states fluctuations on the c-axis resistivity of High Tc superconductors 201
PART II. Near the Vortex-lattice Melting Transition 217
N. K. Wilkin and H. J. Jensen, The effect of disorder on melting and
decoupling transitions in layered superconductors 219
Tao Chen and S. Teitel, Vortex line fluctuations and phase transitions in
type IT superconductors 231
D. Stroud and R. Sasik, Flux lattice melting in the lowest Landau level
approximation: results in three dimensions 239
VII
E. Silva, R. Fastampa, M. Giura, D. Neri and S. Sarti, Fluctuational
contribution to the resistivity in YBa2Cu307_o in magnetic fields 251
P. Pureur and R. Menegotto Costa, Low field fluctuation
magnetoconductivity in Bi2Sr2CaCu208 and YB~Cu307 :
gaussian, critical, and LLL scatings 259
A. V. Nikulov, Fluctuation effects in mixed state of type II
superconductor 271
P. Minnhagen, Two dimensional vortex fluctuations in high Tc
superconductors 279
I. D. Lawrie, Critical vs lowest-Landau-Ievel scaling in the
Ginzburg-Landau theory 293
S. A. Ktitorov and E. S. Babaev, Fluctuations in the lattice
Ginzburg-Landau model 301
I. Herbut, Superconducting transition induced by columnar disorder
in strong magnetic field 311
G. Carneiro, Vortex fluctuations in vortex liquids 323
A. Buzdin and V. Dorin, Magnetic field crossover between 2D and 3D
regimes of gaussian fluctuations in layered superconductors 335
Vl\l
PART III. A Little Bit More Theoretical 343
H. Won, K. MaId and Y. Sun, Aspects of the d-wave superconductivity 345
T. Schneider and J. M. Singer, Universal critical quantum properties of
cuprate superconductors 361
B. N. Narozhny, Theory of superconducting fluctuations in the strong
coupling model 369
R. A. Klemm, Fluctuation phenomena in layered superconductors 377
B. L. GyOrffy, G. Litak and K. I. WysokiIlski, Anderson theorem and
spatial fluctuations in the gap of disordered superconductors 385
L. Capriotti, A. Cuccoli, V. Tognetti, R. Vaia and P. Verrucchi,
Berezinskii-Kosterlitz-Thouless transition in two-dimensional XX:Z
easy-plane quantum Heisenberg magnets 397
J. F. Annett, Pairing symmetry and pairing interactions in the cuprates 405
C. Attanasio, C. Coccorese, L. Maritato, L. Mercaldo and M. Salvato,
Superconducting properties of Nb/CuMn multilayers 415
INDEX 425
LIST OF CONTRIBUTORS 427
PREFACE
These Proceedings of a NATO-ARW (HTECH ARW 96 00 52) held at the
International Center for Theoretical Physics, Trieste, Italy from Aug 5 till Aug 9,
1996 resulted from many discussions between various workers, concerning the need for
a gathering of all (if possible) who were concerned about the subject of
superconductivity fluctuations in High critical Temperature Superconductors (HTS). It
appeared to many that the Skocpol-Tinkham work of 1975 had to be revitalized in view
of the discovery of the new superconducting ceramics and the enormous amount of
work having already taken place. The study of HTS is one of the most prominent
research subject in solid state sciences. The understanding of the role of fluctuations is
also thought to be necessary before technological applications since the fluctuations
may destroy the superconducting state.
The workshop discussions have touched upon (i) Superconducting fluctuations in the
vicinity of the critical transition, (ii) Superconductivity fluctuations near the
percolation transition, and (iii) Fluctuations of the vortex lattice at the lattice melting
temperature. These topics served as initiators for a very great amount of discussions
with many comments from the audience. More than forty "long lectures" and two
"poster sessions" were held. Private discussions going unrecorded but obviously took
place at many locations : lecture halls, staircases, cafetaria, bedrooms, bars, beach, ...
Arguments openly repol ted for the first time were often quite sharp ones
The effect of fluctuations on static properties, and on electrical and thermal transport,
properties in the ab- plane and along the c-axis, the effect of magnetic field on
fluctuation phenomena in specifically layered compounds were intensely debated
subjects. Whether the d-wave order parameter is definitely the main HTS key feature is
still under debate. Nevertheless, it seems that the fluctuation contribution above Tc
away from the critical temperature should take into account a density of states effect
beside the Aslamazov-Larkin and the Maki-Thompson contribution. The c-axis data
on the paraconductivity and the subsequent analysis seems convincing in that respect.
IX
x
The effect of a magnetic field is still unclear. The transport property behaviors near the
Kosterlitz-Thouless transition have been much discussed for various sytems. It is still
hard to say which of the quasi particle scattering or vortex motion is the key
dissipation mechanism in the mixed state and what their respective role is at the
transitions.
Specific fluctuations of the vortex lattice in HTCS as compared to conventional
superconductors were very intensely debated. Quite interesting considerations were
reported for the first time, either from Monte-Carlo simulations or theoretical work. It
appeared that the considerations do not necessarily describe the overall experimental
situations well enough nor give some clearly phrased insight on the processes at hand.
Therefore much work has still to be done on that question. Nevertheless the
complicated (H, T) phase diagram should emerge from all those considerations and
expectations which were presented and discussed. However the type of (first or second
order) transition, the critical exponents, the line(s) or point(s) singularities are major
raised questions for the future and will obviously attract much attention as seen from
the debates which went on. Whether the lowest Landau level approximation or the
vortex motion dissipation is the key theoretical ingredient is still opened. Maybe they
do not describe the same region of the (H, T) plane.
The Proceedings are more or less arbitrarily divided into three parts : one is reserved for
papers mainly considering the Landau-Ginzburg transition, sometimes in presence of a
magnetic field, and including the percolation region. The second part is mainly
concerned with the vortex structure behavior, whether fluctuating or not between
various phases. The third part contains more theoretical papers which could also have
found their place in Part I or Part II ... but a ternary structure is always more appealing.
The various presentations were allowed some space for these proceedings. Due to
various committrnents not all could be inserted in due time. There is more theory than
experiment reported in the following, but often theoreticians took great care in
describing their work with respect to available experimental data.