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arXiv · 1512.03263

Granular superconductivity and magnetic-field-driven recovery of macroscopic coherence in a cuprate/manganite multilayer

B. P. P. Mallett·J. Khmaladze·P. Marsik·E. Perret·A. Cerreta·M. Orlita·N. Biškup·M. Varela·C. Bernhard
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Abstract

We show that in Pr$ _{0.5} $La$ _{0.2} $Ca$ _{0.3} $MnO$ _{3} $/YBa$ _{2} $Cu$ _{3} $O$ _{7} $ (PLCMO/YBCO) multilayers the low temperature state of YBCO is very resistive and resembles the one of a granular superconductor or a frustrated Josephson-junction network. Notably, a coherent superconducting response can be restored with a large magnetic field which also suppresses the charge-orbital order in PLCMO. This coincidence suggests that the granular superconducting state of YBCO is induced by the charge-orbital order of PLCMO. The coupling mechanism and the nature of the induced inhomogeneous state in YBCO remain to be understood.

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B. P. P. Mallett, J. Khmaladze, P. Marsik, E. Perret, A. Cerreta, M. Orlita, N. Biškup, M. Varela, C. Bernhard. 2016-11-13. Granular superconductivity and magnetic-field-driven recovery of macroscopic coherence in a cuprate/manganite multilayer. https://doi.org/10.1103/physrevb.94.180503

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