INTERPRETATION OF THE HARMONIC RESPONSE OF SUPERCONDUCTING FILMS TO INHOMOGENEOUS AC MAGNETIC-FIELDS

被引:14
|
作者
POULIN, GD
PRESTON, JS
STRACH, T
机构
[1] Department of Engineering Physics, McMaster University, Hamilton
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 02期
关键词
D O I
10.1103/PhysRevB.48.1077
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a quantitative analysis of the response of a thin superconducting film to an applied nonuniform ac magnetic field. The analysis is directly applicable to the single-coil inductive measurement technique where a small coil driven by an ac current produces a nonuniform field, with J(C) determined by the appearance of a third-harmonic component of the voltage generated across the coil. We derive a simple model to explain the response of the film to the applied magnetic field in the absence of weak links. This model is used to predict the third-harmonic voltage generated across the coil. The derivation of the model explains why superconducting films having thicknesses even less than the penetration depth screen out the nonuniform ac magnetic fields generated by the coil. A simplified version of the model yields analytic expressions that describe the magnitude and phase of the third-harmonic component at high drive currents while the full model yields excellent agreement with experimental measurements for our highest quality epitaxial films. In other films, the presence of weak links leads to a characteristic signature in the harmonic response at low drive currents. We have also found that ion irradiation can reduce the critical current densities by significant amounts without introducing weak links into the film.
引用
收藏
页码:1077 / 1084
页数:8
相关论文
共 50 条
  • [1] CRITICAL MAGNETIC-FIELDS IN TIN SUPERCONDUCTING FILMS
    ONORI, S
    ROGANI, A
    [J]. PHYSICA B & C, 1980, 100 (01): : 93 - 96
  • [2] SUPERCONDUCTING NBN FILMS IN HIGH MAGNETIC-FIELDS
    TEDROW, PM
    MESERVEY, R
    [J]. BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1981, 26 (03): : 448 - 448
  • [3] CRITICAL MAGNETIC-FIELDS OF GAPLESS SUPERCONDUCTING FILMS
    KRATZIG, E
    [J]. PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1973, 18 (02): : K65 - K67
  • [4] CRITICAL MAGNETIC-FIELDS FOR SUPERCONDUCTING TECHNETIUM FILMS
    TEPLOV, AA
    MIKHEEVA, MN
    GOLYANOV, VM
    [J]. ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI, 1975, 68 (03): : 1108 - 1116
  • [5] ANALYSIS OF MAGNETIC-FIELDS IN THE SLOTTED STRUCTURE OF A SUPERCONDUCTING AC GENERATOR
    SAFI, SK
    BUMBY, JR
    [J]. IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION, 1992, 139 (05) : 411 - 422
  • [6] AC MAGNETORESISTANCE IN STRONGLY INHOMOGENEOUS SOLID MEDIA AND STRONG MAGNETIC-FIELDS
    FISHCHUK, II
    [J]. FIZIKA TVERDOGO TELA, 1989, 31 (05): : 135 - 139
  • [7] PLASMAS IN INHOMOGENEOUS MAGNETIC-FIELDS
    BELLEW, W
    BAKSHI, P
    [J]. BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1972, 17 (11): : 980 - 980
  • [8] THE MIXED STATE OF SUPERCONDUCTING ULTRATHIN FILMS IN PARALLEL MAGNETIC-FIELDS
    SONIN, EB
    [J]. EUROPHYSICS LETTERS, 1992, 18 (01): : 69 - 74
  • [9] PARALLEL CRITICAL MAGNETIC-FIELDS FOR SUPERCONDUCTING VANADIUM AND TECHNETIUM FILMS
    TEPLOV, AA
    MIKHEYEVA, MN
    [J]. ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI, 1980, 79 (06): : 2302 - 2310
  • [10] CRITICAL MAGNETIC-FIELDS OF SUPERCONDUCTING PDH THIN-FILMS
    MESERVEY, R
    TEDROW, PM
    [J]. BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1976, 21 (03): : 340 - 340