Evidence for low-field crossover in the vortex critical velocity of type-II superconducting thin films

被引：27
|
作者：
Grimaldi, G. [1 ,2 ]
Leo, A. [1 ,2 ]
Zola, D. [2 ]
Nigro, A. [2 ]
Pace, S. [2 ]
Laviano, F. [3 ]
Mezzetti, E. [3 ]
机构：
[1] Univ Salerno, CNR SPIN, I-84084 Salerno, Italy
[2] Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Salerno, Italy
[3] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 02期
关键词：
QUANTITATIVE MAGNETOOPTICAL ANALYSIS; FLUX-FLOW INSTABILITY; ELECTRONIC INSTABILITY;
D O I：
10.1103/PhysRevB.82.024512
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We measure current-voltage characteristics as function of magnetic field and temperature in Nb strips of different thickness and width. The instability voltage of the flux-flow state related to the vortex critical velocity v* is studied and compared with the Larkin-Ovchinnikov theory. Beside the usual power-law dependence v* approximate to B-1/2, in the low-field range a new crossover field, B-cr1, is observed below which v* decreases by further lowering the external magnetic field B. We ascribe this unexpected crossover to vortex channeling due to a fanlike penetration of the applied magnetic field as confirmed by magneto-optic imaging. The observation of B-cr1 becomes a direct evidence of a general feature in type-II superconducting films at low fields that is a channel-like vortex motion induced by the inhomogeneous magnetic state caused by the relatively strong pinning.
引用
收藏
页数：6
相关论文
共 50 条
  • [21] Surface effects on vortex dynamics in thin type-II superconducting stripes with random pinning
    Reis, JD
    Venegas, PA
    de Mello, DF
    Cabrera, GG
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2004, 408 : 595 - 596
  • [22] FLUCTUATION EFFECTS ON A STRONGLY PINNED VORTEX LATTICE IN A THIN TYPE-II SUPERCONDUCTING WIRE
    LING, XS
    MCCAMBRIDGE, JD
    RIZZO, ND
    SLEIGHT, JW
    PROBER, DE
    MOTOWIDLO, LR
    ZEITLIN, BA
    PHYSICAL REVIEW LETTERS, 1995, 74 (05) : 805 - 808
  • [23] Equilibrium vortex structures of type-II/1 superconducting films with washboard pinning landscapes
    Wei, C. A.
    Xu, X. B.
    Xu, X. N.
    Wang, Z. H.
    Gu, M.
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2018, 548 : 55 - 60
  • [24] Vortex-motion-induced voltage noise in disordered type-II superconducting films
    Nagoya Inst of Technology, Nagoya, Japan
    J Phys Condens Matter, 15 (L239-L245):
  • [25] Vortex-motion-induced voltage noise in disordered type-II superconducting films
    Enomoto, Y
    JOURNAL OF PHYSICS-CONDENSED MATTER, 1997, 9 (15) : L239 - L245
  • [26] Low field vortex dynamics of BSCCO-2223 superconducting thin films
    Martínez, H
    Mariño, A
    Rodríguez, JE
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2004, 408 : 568 - 570
  • [27] THEORY FOR THE HYSTERETIC PROPERTIES OF THE LOW-FIELD DC MAGNETIZATION IN TYPE-II SUPERCONDUCTORS
    CLEM, JR
    HAO, ZD
    PHYSICAL REVIEW B, 1993, 48 (18): : 13774 - 13783
  • [28] Effects of edge cracks on the thermomagnetic instabilities of type-II superconducting thin films
    Jing, Ze
    NATIONAL SCIENCE REVIEW, 2023, 10 (03)
  • [29] TEMPERATURE DEPENDENCE OF MAGNETIC FIELD AT A VORTEX CENTER IN TYPE-II SUPERCONDUCTING VANADIUM BY NMR
    KUNG, A
    PHYSICAL REVIEW LETTERS, 1970, 25 (15) : 1006 - &
  • [30] Magneto-elastic behaviour of thin type-II superconducting strip with field-dependent critical current
    Zhou, Y. (zhouyh@lzu.edu.cn), 1600, American Institute of Physics Inc. (113):
12345