High-Temperature Superconductors and Related Compounds Studied by Mössbauer Spectroscopy
57Fe, 119Sn, and 151Eu Mössbauer spectroscopy was used to study the chemical structure, phonon mode changes, and low-temperature phase transformation around the Tc as well as suppression of superconductivity in high-temperature superconductors and related compounds. Anomalous temperature-dependent c...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
1993-01-01
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| Series: | Active and Passive Electronic Components |
| Online Access: | http://dx.doi.org/10.1155/1993/92078 |
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| Summary: | 57Fe, 119Sn, and 151Eu Mössbauer spectroscopy was used to study the chemical structure, phonon mode
changes, and low-temperature phase transformation around the Tc as well as suppression of superconductivity
in high-temperature superconductors and related compounds. Anomalous temperature-dependent
changes in the total 57Fe spectral area fraction and in the Mössbauer line shift were simultaneously
found around the Tc in a EuBa2(Cu0.9957Fe0.01)3O7-d superconductor. These anomalous changes
were attributed to phonon softening and low-temperature phase transformation occurring around
the superconducting transition. Significant differences were observed between the 57Fe Mössbauer
spectra of superconducting EuBa2(Cu0.9957Fe0.01)3O7-d and the isostructural non-superconducting
PrBa2(Cu0.9957Fe0.01)3O7-d. The differences were interpreted in connection with the suppression of superconductivity
(by hole filling or hybridization of Pr, Cu and O states) in the Pr-containing compound.
The unusually high isomer shift value observed in the Pr-containing material can give evidence for the
charge transfer mechanism between the Cu(1) chains and the Cu(2) planes and for its role in the
suppression of superconductivity. |
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| ISSN: | 0882-7516 1563-5031 |