SUPERFAST VORTEX CREEP IN YBA2CU3O7-DELTA CRYSTALS WITH COLUMNAR DEFECTS - EVIDENCE FOR VARIABLE-RANGE VORTEX HOPPING

Authors
THOMPSON JR KRUSINELBAUM L CIVALE L BLATTER G FEILD C
Citation
Jr. Thompson et al., SUPERFAST VORTEX CREEP IN YBA2CU3O7-DELTA CRYSTALS WITH COLUMNAR DEFECTS - EVIDENCE FOR VARIABLE-RANGE VORTEX HOPPING, Physical review letters, 78(16), 1997, pp. 3181-3184
Citations number
25
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
78
Issue
16
Year of publication
1997
Pages
3181 - 3184
Database
ISI
SICI code
0031-9007(1997)78:16<3181:SVCIYC>2.0.ZU;2-W
Abstract
We observe a large peak in the vortex creep rate of YBa2Cu3O7-delta cr ystals with columnar defects. The peak appears at the crossover from t he regime where vortices are well localized on columnar pins to a regi me where vortex-vortex interactions dominate, and it is most prominent (nearly 12%) at low fields, near T similar to 40 K. Near this crossov er, 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 v ariable range vortex hopping.