ac susceptibility and critical-current densities in sintered YBa2Cu3O7-δ superconductors

被引：23
作者：
Chen, D. -X.
Pardo, E.
Sanchez, A.
Bartolome, E.
机构：
[1] ICREA, Barcelona 08010, Spain
[2] Univ Autonoma Barcelona, Dept Fis, Grp Electromagnet, E-08193 Barcelona, Spain
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 07期
关键词：
D O I：
10.1063/1.2336596
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The field-amplitude and frequency dependent complex ac susceptibility of a well sintered YBa2Cu3O7-delta disk has been measured at 77 K, which shows that its intra- and intergranular critical-current densities are determined by the collective flux creep inside the grains and the maximum Josephson currents across the grain boundaries, respectively. While the former is widely recognized, the latter contrasts to a popular belief of a mechanism of Josephson-vortex pinning and creep. (c) 2006 American Institute of Physics.
引用
收藏
页数：3
相关论文
共 27 条
[1]   THEORY OF FLUX CREEP IN HARD SUPERCONDUCTORS [J].
ANDERSON, PW .
PHYSICAL REVIEW LETTERS, 1962, 9 (07) :309-&
[2]   Susceptibility of superconductor disks and rings with and without flux creep [J].
Brandt, EH .
PHYSICAL REVIEW B, 1997, 55 (21) :14513-14526
[3]   THE FLUX-LINE-LATTICE IN SUPERCONDUCTORS [J].
BRANDT, EH .
REPORTS ON PROGRESS IN PHYSICS, 1995, 58 (11) :1465-1594
[4]   Superconductor disks and cylinders in an axial magnetic field. I. Flux penetration and magnetization curves [J].
Brandt, EH .
PHYSICAL REVIEW B, 1998, 58 (10) :6506-6522
[5]   AC SUSCEPTIBILITY OF GRAINS AND MATRIX FOR HIGH-TC SUPERCONDUCTORS [J].
CHEN, DX ;
SANCHEZ, A ;
PUIG, T ;
MARTINEZ, LM ;
MUNOZ, JS .
PHYSICA C, 1990, 168 (5-6) :652-667
[6]   Anomalous ac magnetic susceptibility of high-temperature YBa2Cu3O7-δ superconductors -: art. no. 052504 [J].
Chen, DX ;
Pardo, E ;
Sanchez, A ;
Wang, SS ;
Han, ZH ;
Bartolome, E ;
Puig, T ;
Obradors, X .
PHYSICAL REVIEW B, 2005, 72 (05)
[7]   Critical-state and eddy-current ac susceptibilities of conducting cylinders [J].
Chen, DX ;
Pardo, E ;
Gu, C .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2005, 18 (10) :1280-1289
[8]   AC susceptibilities of conducting cylinders and their applications in electromagnetic measurements [J].
Chen, DX ;
Gu, C .
IEEE TRANSACTIONS ON MAGNETICS, 2005, 41 (09) :2436-2446
[9]   Comparison of ac susceptibility of YBa2Cu3O7 coated conductors and single crystals [J].
Chen, DX ;
Pardo, E ;
Sanchez, A ;
Palau, A ;
Puig, T ;
Obradors, X .
APPLIED PHYSICS LETTERS, 2004, 85 (23) :5646-5648
[10]   High-field ac susceptometer using Helmholtz coils as a magnetizer [J].
Chen, DX .
MEASUREMENT SCIENCE AND TECHNOLOGY, 2004, 15 (06) :1195-1202
123