EVIDENCE FOR THE SUPERCONDUCTING GAP FROM INFRARED REFLECTION AND PHONON ANOMALIES IN SUBSTITUTED YBACUO

被引：18

作者：

KUZMANY, H

SUMETSBERGER, B

MATUS, M

ZACHMANN, G

机构：

[1] LUDWIG BOLTZMANN INST FESTKORPERPHYS,A-1090 VIENNA,AUSTRIA

[2] BRUKER ANALYT MESSTECH GMBH,W-7500 KARLSRUHE,GERMANY

来源：

EUROPHYSICS LETTERS | 1990年 / 12卷 / 08期

关键词：

D O I：

10.1209/0295-5075/12/8/006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report experimental results from IR-reflectivity between 4.2 K and 300 K for substituted 123-ceramics with different T, and different approach to the dirty-limit condition. The results show a scaling of the reflectivity increase with T, and with approaching the dirty limit on cooling through T,. Phonon hardening and softening at T, agreed with theoretical predictions if a symmetry-dependent response to the gap is assumed. The BCS-ratio for the caxis gap is deduced to be 1.7&TC. © 1990 IOP Publishing Ltd.

引用

收藏

页码：703 / 708

页数：6

相关论文

共 20 条

[11] ENERGY-GAP MEASUREMENT ON HIGH-TC SUPERCONDUCTORS USING HIGH-RESOLUTION PHOTOEMISSION SPECTROSCOPY [J].

PETROFF, Y .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1989, 162 :845-848

[12] DYNAMICAL CONDUCTIVITY OF HIGH-TC SUPERCONDUCTORS [J].

RENK, KF ;

ESCHRIG, H ;

HOFMANN, U ;

KELLER, J ;

SCHUTZMANN, J ;

OSE, W .

PHYSICA C, 1990, 165 (01) :1-7

[13] OBSERVATION OF AN ENERGY-GAP IN THE FAR INFRARED-SPECTRA OF IRON-DOPED YBA2CU3OX SUPERCONDUCTORS [J].

SEIDER, E ;

BAUER, M ;

GENZEL, L ;

WYDER, P ;

JANSEN, A ;

RICHTER, C .

SOLID STATE COMMUNICATIONS, 1989, 72 (01) :85-88

[14]

SUMETSBERGER B, IN PRESS

[15] BA2YCU3O7-DELTA - ELECTRODYNAMICS OF CRYSTALS WITH HIGH REFLECTIVITY [J].

THOMAS, GA ;

ORENSTEIN, J ;

RAPKINE, DH ;

CAPIZZI, M ;

MILLIS, AJ ;

BHATT, RN ;

SCHNEEMEYER, LF ;

WASZCZAK, JV .

PHYSICAL REVIEW LETTERS, 1988, 61 (11) :1313-1316

[16]

THOMSEN C, 1990, INT WINTERSCHOOL ELE

[17]

Timusk T., 1989, Physical properties of high temperature superconductors I, P339

[18] TEMPERATURE-DEPENDENCE OF THE RAMAN AND INFRARED PHONONS OF MBA2CU3O7-DELTA-TYPE SUPERCONDUCTORS [J].

WITTLIN, A ;

LIU, R ;

CARDONA, M ;

GENZEL, L ;

KONIG, W ;

BAUHOFER, W ;

MATTAUSCH, H ;

SIMON, A ;

GARCIAALVARADO, F .

SOLID STATE COMMUNICATIONS, 1987, 64 (04) :477-481

[19] BONDS, BANDS, CHARGE-TRANSFER EXCITATIONS AND SUPERCONDUCTIVITY OF YBA2CU3O7-DELTA [J].

YU, J ;

MASSIDDA, S ;

FREEMAN, AJ ;

KOELING, DD .

PHYSICS LETTERS A, 1987, 122 (3-4) :203-208

[20] SUPERCONDUCTIVITY-INDUCED PHONON SELF-ENERGY EFFECTS IN HIGH-TC SUPERCONDUCTORS [J].

ZEYHER, R ;

ZWICKNAGL, G .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1990, 78 (02) :175-190