High pressure synthesis of a new superconductor Sr2CuO2+xCl2-y induced by apical oxygen doping

TL;DR

This paper reports the high-pressure synthesis of a new p-type cuprate superconductor, Sr2CuO2+xCl2-y, achieved through apical oxygen doping, with a transition temperature of 30K.

Contribution

It introduces a novel high-pressure synthesis method for a new superconductor via apical oxygen doping in oxychloride cuprates.

Findings

Superconductor crystallizes in I4/mmm space group.

Achieved bulk superconductivity at 30K.

Structural and magnetic measurements confirm superconductivity.

Abstract

Using the apical oxygen doping mechanism, i.e. a partial substitution of divalence O for the monovalence Cl, a p-type oxychloride cuprate superconductor, Sr2CuO2+xCl2-y, was synthesized at high pressure high temperature. The x-ray diffraction refinement suggests the superconductor crystallizes into a 0201 structure with space group I4/mmm and lattice parameters being a=3.92A, c=15.6 A. The magnetic susceptibility as well as resistance measurements indicated that the bulk superconductivity with transition temperature 30K was achieved in the sample.