Entropy of vortex cores on the border of the superconductor-to-insulator transition in an underdoped cuprate

Abstract

We present a study of Nernst effect in underdoped $L{a}_{2-x}S{r}_{x}Cu{O}_4$ in magnetic fields as high as 28T. At high fields, a sizeable Nernst signal was found to persist in presence of a field-induced non-metallic resistivity. By simultaneously measuring resistivity and the Nernst coefficient, we extract the entropy of vortex cores in the vicinity of this field-induced superconductor-insulator transition. Moreover, the temperature dependence of the thermo-electric Hall angle provides strong constraints on the possible origins of the finite Nernst signal above $T_c$, as recently discovered by Xu et al.

5 Pages inculding 4 figures

References in corpus (1)

• Spins in the Vortices of a High Temperature Superconductor

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