Field dependence of the resistive transition in Tl2Ba2CuO6+δ

Carrington, A.; Mackenzie, A. P.; Sinclair, D.C.; Cooper, J.R.

doi:10.1103/PhysRevB.49.13243

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Field dependence of the resistive transition in Tl₂Ba₂CuO_6+δ

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Carrington, A., Mackenzie, A. P., Sinclair, D., & Cooper, J. (1994). Field dependence of the resistive transition in Tl₂Ba₂CuO_6+δ. Physical Review B, 49(18), 13243-13246. doi:10.1103/PhysRevB.49.13243.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-E73F-4

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.