Structural and T-c inhomogeneities inherent to doping in La2-xSrxCuO4 superconductors and their effects on the precursor diamagnetism

Article

关键词: FLUCTUATION-INDUCED DIAMAGNETISM;    LA1.9SR0.1CUO4 SUPERCONDUCTORS;    TEMPERATURE CURVES;    CROSSING POINT;    ATOMIC-SCALE;    STATE;    FIELD;    BI2SR2CACU2O8+DELTA;    MAGNETIZATION;    WELL;   

DOI  :  10.1103/PhysRevB.80.214527

来源: SCIE

【 摘 要 】

The inhomogeneities inherent to the random distribution of Sr dopants in La2-xSrxCuO4 superconductors are probed by measuring the x-ray diffraction linewidths and the Meissner transition widths, and then consistently explained on the grounds of a simple model in which the local Sr content is calculated by averaging over distances close to the in-plane electronic mean free path. By taking into account these intrinsic bulk inhomogeneities with long characteristic lengths (much larger than the superconducting coherence length amplitudes), the precursor diamagnetism measured above T-c, a fingerprint of the superconducting transition own nature, is then explained for all doping levels in terms of the conventional Gaussian-Ginzburg-Landau approach for layered superconductors. These results also suggest that the electronic inhomogeneities observed in the normal state by using surface probes overestimate the ones in the bulk.

【 授权许可】

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