Evidences of Superconductivity without Direct Relation to Valence Electron Density in Metal Doped Y123 Cuprates

TL;DR

This study demonstrates that superconductivity in metal-doped Y123 cuprates occurs independently of valence electron density, challenging traditional assumptions and revealing unique properties in Fe-doped samples.

Contribution

It provides experimental and theoretical evidence that Tc is not directly related to valence electron density in doped cuprates, and highlights unique features of Fe-doped Y123.

Findings

Superconductivity does not depend on valence electron density.

Fe-doped Y123 shows unique superconducting characteristics.

Experimental and theoretical support for non-traditional Tc dependence.

Abstract

We investigated systemically YBa2Cu3-x(Fe, Co, Al, Zn)xO7-{\delta} (x=0.0\sim0.5) cuprates through the XRD, the test of superconductivity, oxygen contents,positron annihilation technology and simulated calculations. The experimental results and theoretic calculations support such a conclusion that the Tc does not depend directly on the density of valence electron in the samples. Moreover, whether or not it may imply some correlations between Fe-oxide superconductors and cuprates that Fe doped Y123 samples show some unique characteristics.