Parallel and perpendicular susceptibility above Tc in La2xSrxCuO4 single crystals

Gil Drachuck, Meni Shay, Galina Bazalitsky, Jorge Berger, and Amit Keren
Phys. Rev. B 85, 184518 – Published 14 May 2012

Abstract

We report direction-dependent susceptibility and resistivity measurements on La2xSrxCuO4 single crystals. These crystals have rectangular needle-like shapes with the crystallographic “c” direction parallel or perpendicular to the needle axis, which, in turn, is in the applied field direction. At optimal doping we find finite diamagnetic susceptibility above Tc, namely fluctuating superconductivity (FSC), only when the field is perpendicular to the planes. In underdoped samples we find FSC in both field directions. We provide a phase diagram showing the FSC region, although it is sample dependent in the underdoped cases. The variations in the susceptibility data suggest a different origin for the FSC between underdoping (below 10%) and optimal doping. Finally, our data indicate that the spontaneous vortex diffusion constant above Tc is anomalously high.

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  • Received 14 August 2011

DOI:https://doi.org/10.1103/PhysRevB.85.184518

©2012 American Physical Society

Authors & Affiliations

Gil Drachuck1, Meni Shay1,2, Galina Bazalitsky1, Jorge Berger2, and Amit Keren1

  • 1Department of Physics, Technion - Israel Institute of Technology, Haifa, 32000, Israel
  • 2Department of Physics and Optical Engineering, Ort Braude College, P.O. Box 78, 21982 Karmiel, Israel

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Issue

Vol. 85, Iss. 18 — 1 May 2012

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