Mössbauer observation near the superconducting transition temperature in the TlBaCa3Cu3O8.5 superconductor
Zeng Yiwei, Yan Xiaohua, Lin Minzhu, Meng Xianren, Cao Huixian, Wu Xiaoshan, Tu Qingyun, Lin Zhenjin
DOI 10.1103/PhysRevB.44.867 · Physical Review B
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Abstract
The TlBaCa3Cu3O8.5 superconductor contains two main superconducting phases, 1:2:2:3 and 2:2:2:3, identified by powder x-ray analysis. Using Fe57 Mössbauer nuclei as the probe, it has been confirmed that the results are the same as those furnished by x-ray analysis. It has also been proved that iron atoms in the lattice substitute two inequivalent sites of copper atoms for each main phase. We have observed a temperature dependence of the Mössbauer parameters, i.e., quadrupole splitting, isomer shift, and relative resonance area. Here several problems are discussed related to the lattice dynamics and the electric charge transfer, which takes place in the transition from normal state to superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlBaCa3Cu2.93Fe0.07O8.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| TlBaCa3Cu2.93Fe0.07O8.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | zero_resistance |
| TlBaCa3Cu3O8.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 123 | Pressure not reported | onset |
| TlBaCa3Cu3O8.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 116 | Pressure not reported | zero_resistance |
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