Susceptibility, crystal-structure, and specific-heat studies of the high-Tc superconductor and quenched YBa2(Cu0.91Fe0.09)3Ox
I. Felner, Y. Wolfus, G. Hilscher, N. Pillmayr
DOI 10.1103/PhysRevB.39.225 · Physical Review B
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Abstract
Magnetic susceptibility, poweder x-ray diffraction, and specific-heat measurements were used to study the high-temperature superconductor YBa2(Cu0.91Fe0.09)3O7.1 and the nonsuperconductor quenched YBa2(Cu0.91Fe0.09)3O6.1 samples. The crystal structure for both samples is tetragonal with almost the same lattice parameters. No magnetic spin-glass state of Fe is observed in the two samples at low temperatures and the quenched sample exhibits antiferromagnetic behavior, whereas the magnetization is nonlinear as a function of the applied field. For the superconducting sample, magnetic irreversibilities appear below a temperature Tg whose field dependence differs substantially from that observed in spin glasses. Tg scales with the applied field as H14. The linear term obtained from the specific-heat studies is extremely high, γ=73 mJ/molK2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2(Cu0.91Fe0.09)3O7.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2(Cu0.91Fe0.09)3O7.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu2.73Fe0.27O7.13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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