Tuning the superconducting state in the magnetic MoSr2YCu2O8 materials

TL;DR

This study demonstrates how oxygen content influences the magnetic and superconducting properties of MoSr2YCu2O8, revealing tunable superconductivity and coexistence with antiferromagnetism.

Contribution

It shows systematic control of superconductivity in MoSr2YCu2O8 through oxygen annealing, highlighting the coexistence of AFM and SC states with distinct transition temperatures.

Findings

Superconducting transition temperature (TC) increases with oxygen annealing.

Antiferromagnetic order (TN) remains unaffected by superconductivity.

Oxygen content effectively tunes the magnetic and superconducting states.

Abstract

The properties of the MoSr2YCu2O8 materials are found to systematically change with the oxygen concentration determined by the sintering and annealing conditions. The as-prepared (asp) sample is anti-ferromagnetically (AFM) ordered at 16 K. The magnetic features are related to the Mo5+ sublattice. Annealing under an oxygen atmosphere induces superconductivity (SC) in the Cu-O planes, and the TC and the shielding fraction values obtained depend strongly on the oxygen concentration. Annealing the asp material at 1030 C under ambient oxygen atmosphere yields TC of 18 K, whereas further annealing at 650 C under 92 atm. of oxygen, shifts TC to 32 K. The AFM ordering, which coexists with SC state through effectively decoupled subsystems, is not affected by the presence or absence of the SC state. In all samples studied, TN < TC. This behavior resembles most of the inter-metallic magneto-superconductors, but is in sharp contrast to the iso-structural RuSr2GdCu2O8 system where TN > TC.