Evidence for Diverging Barriers in the Disordered Vortex Solid in the (K,Ba)BiO3 Superconducting Oxide
I. Joumard, T. Klein, J. Marcus
DOI 10.1103/PhysRevLett.87.167002 · Physical Review Letters
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Abstract
Vortex dynamics has been investigated in the cubic (K,Ba)BiO3 superconductor using ac susceptibility measurements on a large frequency range (0.03Hz<ω<60kHz). Power law diverging barriers have been obtained on both sides of the order-disorder transition line. The μ exponent remains close to 5/2 (elastic creep value) in some part of the disordered phase and finally decreases at high temperature and/or high field, in good agreement with the recent plastic collective creep theory [J. Kierfeld, H. Nordborg, and V. M. Vinokur, Phys. Rev. Lett., 85, 4948 (2000)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31.2 | Pressure unresolved | onset |
| (K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure unresolved | onset |
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