Superfast vortex creep in YBa2Cu3O7-delta crystals with columnar defects: Evidence for variable-range vortex hopping

被引:92
作者
Thompson, JR
KrusinElbaum, L
Civale, L
Blatter, G
Feild, C
机构
[1] UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996
[2] IBM CORP,RES,YORKTOWN HTS,NY 10598
[3] COMIS NACL ENERGIA ATOM,CTR ATOM BARILOCHE,RA-8400 SAN CARLOS BARILO,RIO NEGRO,ARGENTINA
[4] ETH HONGGERBERG,CH-8093 ZURICH,SWITZERLAND
关键词
D O I
10.1103/PhysRevLett.78.3181
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We observe a large peak in the vortex creep rate of YBa2Cu3O7-delta crystals with columnar defects. The peak appears at the crossover from the regime where vortices are well localized on columnar pins to a regime where vortex-vortex interactions dominate, and it is most prominent (nearly 12%) at low fields, near T similar to 40 K. Near this crossover, the current dependent creep activation energy U(J) shows distinct and unusual behavior (''pinch''). On the high-J side of the pinch, the glassy exponent mu - 1/3 and large creep rate are characteristic of variable range vortex hopping.
引用
收藏
页码:3181 / 3184
页数:4
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