Resistive upper critical fields and irreversibility lines of optimally-doped high-T_c cuprates

Preprint

13 August 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9908190

Abstract

We present the resistively-determined upper critical field H^{\rho}_{c2}(T) and the irreversibility lines H^{\rho}_{irr}(T) of various high-T_c cuprates, deduced from measurements in 61-T pulsed magnetic fields applied parallel to the c-axis. The SHAPE of both H^{\rho}_{c2}(T) and H^{\rho}_{irr}(T) depends monotonically on the anisotropy of the material and none of the samples show saturation of H^{\rho}(T) at low temperatures. The anomalous positive curvature, d^2 H^{\rho}/dT^2 > 0, is the strongest in materials with the largest normal-state anisotropy, regardless of whether anisotropy is varied by changing the carrier concentration or by comparing a variety of optimally-doped compounds.

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Version 1, 1999-08-13, ArXiv
Published version: Physical Review B, 60 (17), 12475.

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