Field dependence of the resistive transition in Tl2Ba2CuO6+δ

A CARRINGTON, A P MACKENZIE, D C SINCLAIR, J R COOPER

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Abstract

We report measurements of the magnetic-field dependence of the resistive transition in Tl2Ba2CuO6+delta for several crystals with transition temperatures in the range 15 K less-than-or-equal-to T(c) less-than-or-equal-to 62 K. The transition of the most overdoped sample (with the lowest transition temperature) shifts monotonically to lower temperature with increasing field with no appreciable change in shape. As reported previously [A. P. Mackenzie et al., Phys. Rev. Lett. 71, 1238 (1993)], the behavior of the upper critcal field (H(c2)) inferred from these measurements does not, however, have the classical BCS form. The samples with higher transition temperatures show a gradual and systematic crossover to field-broadened transitions, with a kneelike structure developing in sufficiently high fields. Some possible interpretations of these observations are discussed.

Original languageEnglish
Pages (from-to)13243-13246
Number of pages4
JournalPhysical Review. B, Condensed matter
Volume49
Issue number18
DOIs
Publication statusPublished - 1 May 1994

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