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

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

2001-08-17

arxiv.org/abs/cond-mat/0108277v2

Physics

Condensed Matter

Superconductivity

5 Pages inculding 4 figures

Scientific paper

10.1103/PhysRevLett.88.056601

We present a study of Nernst effect in underdoped $La_{2-x}Sr_xCuO_4$ 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.

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