PROXIMITY EFFECT-INDUCED SUPERCONDUCTIVITY AND NMR RELAXATION IN NB-CU MULTILAYERS

被引:10
作者
ZHENG, GQ
KITAOKA, Y
ODA, Y
ASAYAMA, K
OBI, Y
FUJIMORI, H
AOKI, R
机构
[1] OSAKA UNIV,FAC ENGN,DEPT ELECT ENGN,SUITA,OSAKA 565,JAPAN
[2] TOHOKU UNIV,INST MAT RES,SENDAI,MIYAGI 980,JAPAN
关键词
SUPERCONDUCTING PROXIMITY EFFECT; ENERGY GAP; SUPERCONDUCTING MULTILAYERS; NB-CU; CU-63; NMR; SPIN-LATTICE RELAXATION RATE;
D O I
10.1143/JPSJ.60.599
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The nuclear spin lattice relaxation rate, T1(-1), for Cu-63 in zero field from 8 K down to 0.3 K, has been measured in Nb-Cu multilayered thin films where both the Nb- and Cu-layer thicknesses are much smaller compared to the coherence lengths. A BCS-like temperature dependence of T1(-1) replaced gradually by a Korringa-law-like one at low temperatures has been found. A dependence of the relaxation on the Cu-layer thickness at low temperatures has also been found. It has been proposed and confirmed by a series of experiments that superconductivity in the Cu-layer induced by the proximity effect has an anisotropic energy gap, reflecting the geometrical feature of a thin film.
引用
收藏
页码:599 / 607
页数:9
相关论文
共 18 条
  • [1] NUCLEAR SPIN-LATTICE RELAXATION IN METALS
    ANDERSON, AG
    REDFIELD, AG
    [J]. PHYSICAL REVIEW, 1959, 116 (03): : 583 - 591
  • [2] CU-63 NMR-STUDY OF SUPERCONDUCTING CU/NB MULTILAYER-FILM
    AOKI, R
    KOHORI, Y
    ZHENG, GQ
    ODA, Y
    ASAYAMA, K
    WADA, S
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1987, 56 (12) : 4495 - 4502
  • [3] SUPERCONDUCTIVITY OF NIOBIUM FILMS
    ASADA, Y
    NOSE, H
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1969, 26 (02) : 347 - +
  • [4] SUPERCONDUCTIVITY OF NB/CU SUPER-LATTICES
    BANERJEE, I
    YANG, QS
    FALCO, CM
    SCHULLER, IK
    [J]. SOLID STATE COMMUNICATIONS, 1982, 41 (11) : 805 - 808
  • [5] DIMENSIONAL CROSSOVER IN SUPERLATTICE SUPERCONDUCTORS
    CHUN, CSL
    ZHENG, GG
    VICENT, JL
    SCHULLER, IK
    [J]. PHYSICAL REVIEW B, 1984, 29 (09) : 4915 - 4920
  • [6] DEUTSCHER G, 1969, SUPERCONDUCTIVITY, V2, pCH17
  • [7] GOLDBERG IB, 1968, J PHYS SOC JPN, V24, P1504
  • [8] HEBEL LC, 1959, PHYS REV B, V33, P4620
  • [9] UNUSUAL BEHAVIOR OF NUCLEAR-RELAXATION IN CECU2SI2 - POSSIBLE EVIDENCE FOR TRIPLET SUPERCONDUCTIVITY
    KITAOKA, Y
    UEDA, K
    KOHARA, T
    ASAYAMA, K
    [J]. SOLID STATE COMMUNICATIONS, 1984, 51 (07) : 461 - 466
  • [10] Kittel C, INTRO SOLID STATE PH, V8th