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

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 16期

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.

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页码：3181 / 3184

页数：4

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