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Inhomogeneous magnetic-field response of YBa2Cu3Oy and La2-xSrxCuO4 persisting above the bulk superconducting transition temperature
Authors:Sonier J E  Ilton M  Pacradouni V  Kaiser C V  Sabok-Sayr S A  Ando Y  Komiya S  Hardy W N  Bonn D A  Liang R  Atkinson W A
Institution:Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
Abstract:We report that in YBa2Cu3Oy and La2-xSrxCuO4 there is a spatially inhomogeneous response to the magnetic field for temperatures T extending well above the bulk-superconducting transition temperature Tc. An inhomogeneous magnetic response is observed above Tc even in ortho-II YBa2Cu3O6.50, which has highly ordered doping. The degree of the field inhomogeneity above Tc tracks the hole-doping dependences of both Tc and the density of the superconducting carriers below Tc, and therefore is apparently coupled to superconductivity.
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