Transition from activated to diffusive behavior in the vortex-liquid state in YBa 2 Cu 3 </mml:mrow…
1991; American Physical Society; Volume: 66; Issue: 23 Linguagem: Inglês
10.1103/physrevlett.66.3075
ISSN1092-0145
AutoresT. R. Chien, T. W. Jing, N. P. Ong, Z. Z. Wang,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoIn the vortex-liquid state in ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ there exist two distinct dissipative states separated by a field ${\mathit{H}}_{\mathit{k}}$. Below ${\mathit{H}}_{\mathit{k}}$, the resistivity is strongly field activated, with a prefactor that is anomalously enhanced over the normal-state resistivity ${\mathrm{\ensuremath{\rho}}}_{\mathit{N}}$ by \ensuremath{\sim}12 orders of magnitude. At ${\mathit{H}}_{\mathit{k}}$, the prefactor collapses to a temperature-independent value equal to ${\mathrm{\ensuremath{\rho}}}_{\mathit{N}}$, and the vortex motion becomes diffusive. The existence of the ${\mathit{H}}_{\mathit{k}}$ boundary is also reflected in the anomalous behavior of the Hall resistivity.
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