Superfast Vortex Creep in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} Crystals with Columnar Defects: Evidence for Variable-Range Vortex Hopping
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 and Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
- IBM Research, Yorktown Heights, New York 10598 (United States)
- Centro Atomico Bariloche--CNEA, 8400 Bariloche (Argentina)
- ETH-Hoenggerberg, CH-8093 Zuerich (Switzerland)
We observe a large peak in the vortex creep rate of YBa{sub 2}Cu{sub 3}O{sub 7-{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{percent}) at low fields, near T{approximately}40K. Near this crossover, the current dependent creep activation energy U(J) shows distinct and unusual behavior ({open_quotes}pinch{close_quotes}). On the high-J side of the pinch, the glassy exponent {mu}{approximately}1/3 and large creep rate are characteristic of variable range vortex hopping. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 491667
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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