NMR-STUDIES OF SPIN EXCITATIONS IN SUPERCONDUCTING BI2SR2CACU2O8+DELTA SINGLE-CRYSTALS

被引：44

作者：

TAKIGAWA, M

MITZI, DB

机构：

[1] IBM T. J. Watson Research Center, Yorktown Heights, NY 10598

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.73.1287

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The oxygen NMR shift and the Cu nuclear spin-lattice relaxation rate (1/T1) were measured in Bi2.1Sr1.9Ca0.9Cu2.1O8+delta single crystals. While both the shift and 1/T1T decrease sharply near T(c), 1/T1T becomes nearly constant at low temperatures, indicating a gapless superconducting state with finite density of states at the Fermi level. From the oxygen shift data, the residual spin susceptibility at T = 0 is estimated to be 10% of the value at room temperature. Our results are most consistent with a d-wave pairing model with strong (resonant) impurity scattering.

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页码：1287 / 1290

页数：4

相关论文

共 32 条

[1]

ABRIKOSOV AA, 1961, SOV PHYS JETP-USSR, V12, P1243

[2] THEORY OF DIRTY SUPERCONDUCTORS [J].

ANDERSON, PW .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1959, 11 (1-2) :26-30

[3] CU-63 KNIGHT-SHIFTS IN THE SUPERCONDUCTING STATE OF YBA2CU3O7-DELTA(TC=90-K) [J].

BARRETT, SE ;

DURAND, DJ ;

PENNINGTON, CH ;

SLICHTER, CP ;

FRIEDMANN, TA ;

RICE, JP ;

GINSBERG, DM .

PHYSICAL REVIEW B, 1990, 41 (10) :6283-6296

[4] NEUTRON-DIFFRACTION STUDY OF THE MODULATED STRUCTURE OF BI2(SR, CA)3CU2O8+Y [J].

BESKROVNYI, AI ;

DLOUHA, M ;

JIRAK, Z ;

VRATISLAV, S ;

POLLERT, E .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1990, 166 (1-2) :79-86

[5] EFFECT OF VORTEX FLUCTUATIONS ON TL-205 SPIN-LATTICE RELAXATION IN THE MIXED-STATE OF TL2BA2CUO6 [J].

BULAEVSKII, LN ;

KOLESNIKOV, NN ;

SCHEGOLEV, IF ;

VYASELEV, OM .

PHYSICAL REVIEW LETTERS, 1993, 71 (12) :1891-1894

[6] CALCULATION OF THE TRANSVERSE NUCLEAR-RELAXATION RATE FOR YBA2CU3O7 IN THE SUPERCONDUCTING STATE [J].

BULUT, N ;

SCALAPINO, DJ .

PHYSICAL REVIEW LETTERS, 1991, 67 (20) :2898-2901

[7] WEAK-COUPLING MODEL OF SPIN FLUCTUATIONS IN THE SUPERCONDUCTING STATE OF THE LAYERED CUPRATES [J].

BULUT, N ;

SCALAPINO, DJ .

PHYSICAL REVIEW B, 1992, 45 (05) :2371-2384

[8]

DUDBO A, 1994, PHYS REV B, V49, P12245

[9]

GRIFFIN A, 1965, LOW TEMP PHYS, P524

[10] EFFECT OF STRONG SCATTERING ON THE LOW-TEMPERATURE PENETRATION DEPTH OF A D-WAVE SUPERCONDUCTOR [J].

HIRSCHFELD, PJ ;

GOLDENFELD, N .

PHYSICAL REVIEW B, 1993, 48 (06) :4219-4222

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