Tuning the superconducting state in the magnetic MoSr2YCu2O8−δ materials
I. Felner, E. Galstyan
DOI 10.1103/PhysRevB.69.024512 · Physical Review B
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Abstract
The properties of MoSr2YCu2O8−δ materials are found to systematically change with the oxygen concentration determined by the sintering and annealing conditions. The as-prepared (asp) sample is antiferromagnetically 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 antiferromagnetic 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoSr2YCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure unresolved | onset |
| MoSr2YCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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