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Robust intrinsic electronic superconducting phases in underdoped La_{2-x}Sr_xCuO4 single crystals

X. L. Dong·P. H. Hor·F. Zhou·Z. -X. Zhao
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Abstract

We have measured the superconducting critical temperature (Tc) and the diamagnetic susceptibility of La2-xSrxCuO4 single crystals in various magnetic fields. We observed a field-induced evolution from an apparent Tc phase to an intrinsic Tc1 = 15 K or Tc2 = 30 K phase characterized by "magic" hole concentration which is commensurate with that of a two dimensional electronic lattice. The onset Tc of the intrinsic superconducting phases remains robust up to H = 5 Tesla. We suggest that the intrinsic superconducting phases at "magic" doping concentrations are the pristine electronic phases of high temperature superconductivity.

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X. L. Dong, P. H. Hor, F. Zhou, Z. -X. Zhao. 2006-10-31. Robust intrinsic electronic superconducting phases in underdoped La_{2-x}Sr_xCuO4 single crystals. https://doi.org/10.1016/j.ssc.2007.10.034

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