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/lp/american-physical-society-aps/flux-creep-activation-energies-in-tl-2-ba-2-cacu-2-o-x-single-crystals-ASAAvfHkUL
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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 1992 The American Physical Society
- ISSN
- 1095-3795
- DOI
- 10.1103/PhysRevB.45.5641
- Publisher site
- See Article on Publisher Site
Abstract
The measured frequency shift in temperature of the ac susceptibility Tl 2 Ba 2 CaCu 2 O x single crystals is modeled by an Arrhenius-like expression to give flux-creep activation energies at various applied ac magnetic fields ranging from 15 to 200 Oe. The activation energies range from 288±14 meV in an applied ac magnetic field of 15 Oe to 25±3 meV in 200 Oe. Considerable flux creep is observed. It is estimated that H c 1 at a temperature of about 100 K is approximately 10 Oe. The results are interpreted in terms of Anderson flux-creep model and the activation-energy values reported here are similar to those deduced from magnetic-field-dependent resistivity measurements on the Tl-based single crystals, textured films, and bulk samples. The field dependence of the activation energies is observed to vary as 1/ √ H . This low-field dependence is explained by a scaling argument where the vortex volume is approximated by ξ 2 a 0 , with ξ the coherence length in the ab plane and a 0 the Abrikosov vortex-lattice spacing along the c axis of the crystal lattice.
Journal
Physical Review B – American Physical Society (APS)
Published: Mar 1, 1992