Fe57 Mössbauer study of the Tl2Ca1.5Ba1.7(Cu1−xFex)3O9 superconductor
Zeng Yiwei, Yan Xiaohua, Lin Mingzhu, Ren Yanru, Meng Xianren, Lu Yongning, Tu Qingyun, Wu Xiaoshan, Sang Lihua
DOI 10.1103/PhysRevB.40.727 · Physical Review B
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Abstract
The results of Fe57 Mössbauer-effect studies on high-Tc Tl2Ca1.5Ba1.7(Cu1−xFex)3O9 with x=0.01, 0.05, and 0.07 are reported in this paper. The Mössbauer spectra depend on concentration and show three quadrupole doublets that can be related to different Cu sites at different phases and to the number of oxygen vacancies. The site preference of Fe is identified by fitted Mössbauer results. The parameter of a Mössbauer spectrum run at 77 K indicates that in the superconducting state the density of s electrons at Cu sites is different from that of the normal state. The data from x-ray diffraction are given for x=0.01 and 0.07 and analyzed results show that the 2:1:2:2 phase and 2:2:2:3 phase have an intergrowth in our samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ca1.5Ba1.7(Cu1-xFex)3O9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | midpoint |
| Tl2Ca1.5Ba1.7(Cu1-xFex)3O9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | midpoint |
| Tl2Ca2Ba2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2CaBa2Cu2O8+x 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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