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Measurement of the Anisotropy of the Lamb–Mössbauer Factor in EuBa2Cu3O7

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Abstract

The lattice dynamics of high-Tc EuBCO superconductor was studied by means of Mössbauer spectroscopy of the 151Eu ion in samples with oriented grains. Three samples were prepared: one oriented by means of 8 T magnetic field, another by means pressure; the third was left random. The orientation distribution function was determined be means of X-ray diffraction. By comparison of the absorption areas of the oriented samples with respect to the random one, the Lamb–Mössbauer factor ratio corresponding to the motions in c-direction and ab-plane was determined. This ratio turned out to be independent of the temperature and of value 0.25±0.05. This very small value can be explained only if a strong anharmonicity is present, which mainly concerns the c-direction motion.

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Authors and Affiliations

  1. Istituto di Ricerca sulle Onde Elettromagnetiche, CNR, I-50127, Florence, Italy

    L. Cianchi & F. Del Giallo

  2. Department of Physics, University of Florence, I-50019, Sesto F.no, Italy

    F. Lucchi

  3. Affiliated to INFM - unit of Florence, Department of Physics, University of Florence, I-50019, Sesto F.no, Italy

    G. Spina

Authors
  1. L. Cianchi
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  2. F. Del Giallo
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  3. F. Lucchi
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  4. G. Spina
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Cianchi, L., Del Giallo, F., Lucchi, F. et al. Measurement of the Anisotropy of the Lamb–Mössbauer Factor in EuBa2Cu3O7 . Hyperfine Interactions 136, 105–123 (2001). https://doi.org/10.1023/A:1015556430015

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