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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: single-CuO2-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.
Bibliographical noteFunding Information:
We thank P.A. Crowell for the use of the 9 T Quantum Design, Inc., Physical Properties Measurement System (PPMS). The 14 T data were obtained with a PPMS in the Geballe Laboratory for Advanced Materials at Stanford University. The work on Hg1201 was funded by the Department of Energy through the University of Minnesota Center for Quantum Materials, under DE-SC-0016371. The work on Bi2201 and LSCO was supported by NSF Grant No. 1006617 and by the NSF through the University of Minnesota MRSEC under Grant No. DMR-1420013. The work at the TU Wien was supported by FWF project P27980-N36 and the European Research Council (ERC Consolidator Grant No. 725521). The work at the Jilin University was supported by National Natural Science Foundation of China (Grant No. 21371068).
© 2019 American Physical Society.
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