Susceptibility, crystal-structure, and Mössbauer study of the high-temperature superconductor YBa2Cu3O7−δ doped with iron
X. Z. Zhou, M. Raudsepp, Q. A. Pankhurst, A. H. Morrish, Y. L. Luo, I. Maartense
DOI 10.1103/PhysRevB.36.7230 · Physical Review B
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Abstract
Resistance and ac susceptibility measurements, Fe57 Mössbauer spectroscopy, and powder x-ray crystal-structure refinements were used to study the high-temperature superconductor YBa2(Cu1−xFex)3O7−δ. The superconducting transition temperature decreased as the Fe content was increased. The crystal structure is markedly orthorhombic for x=0, but the cell parameters a and b are nearly equal for 0.015<x<0.100. In addition, the difference between a and b decreases systematically with Fe content; they are equal at x=0.100. The Mössbauer spectra above about 10 K consist of three doublets; their site assignments are proposed. Measurements of the Fe57 recoil-free fraction as a function of temperature yielded a Debye temperature of about 455 K. Below 10 K, magnetic ordering of iron was observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2(Cu1-xFex)3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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