engleski

Universal precursor of superconductivity in the cuprates

Using torque magnetometry, we reveal remarkably simple universal behavior of the superconducting (SC) precursor in the cuprates by tracking the nonlinear diamagnetism above Tc in four distinct compounds: singleCuO2-layer HgBa2CuO4+δ , La2−xSrxCuO4 and Bi2(Sr, La)2CuO6+δ , and double-layer Bi2Sr2Ca0.95Y0.05Cu2O8+δ . We find that SC diamagnetism vanishes in an exponential manner, characterized by a universal temperature scale that is approximately independent of compound and Tc. We discuss the possibility that this unusual behavior signifies the proliferation of SC clusters as a result of intrinsic inhomogeneity inherent to the cuprates.

superconducting (SC) precursor ; cuprates

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