Intrinsic electronic superconducting phases at 60K and 90K in double-layer YBa2Cu3O6+δ

Abstract

We study superconducting transition temperature (Tc) of oxygen-doped double-layer high-temperature superconductors YBa2Cu3O6+δ (0⩽δ⩽1) as a function of the oxygen dopant concentration (δ) and planar hole-doping concentration (Ppl). We find that Tc, while clearly influenced by the development of the chain ordering as seen in the Tc vs δ plot, lies on a universal curve originating at the critical hole concentration (Pc)=1∕16 in the Tc vs Ppl plot. Our analysis suggests that the universal behavior of Tc(Ppl) can be understood in terms of the competition and collaboration of chemical phases and electronic phases that exist in the system. We conclude that the global superconductivity behavior of YBa2Cu3O6+δ as a function of doping is electronically driven and dictated by pristine electronic phases at magic doping numbers that follow the hierarchical order based on Pc, such as 2×Pc, 3×Pc, and 4×Pc. We find that there are at least two intrinsic electronic superconducting phases of Tc=60K at 2×Pc=1∕8 and Tc=90K at 3×Pc=3∕16.

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