Metastability in EuBa2(Cu1-xSnx)3O7-y studied by Sn119 and Eu151 Mössbauer spectroscopy

E. Kuzmann, Z. Homonnay, A. Vértes, M. Gal, K. Torkos, B. Csakvari, G. K. Solymos, G. Horvath, J. Bankuti, I. Kirschner, L. Korecz

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Abstract

The metallic oxide compound system EuBa2(Cu1-xSnx)3O7-y (x=0.05,0.10, 0.20) was prepared for investigation with Eu151 and Sn119 Mössbauer spectroscopy. The best fits of the Sn119 Mössbauer lines reveal at least two different SnIV sites. The Eu151 spectra are characteristic for EuIII state in these compounds. We have found a considerable difference between the shapes of Sn119 Mössbauer spectra recorded at room temperature and those recorded at the temperature of liquid nitrogen in the case of the sample having the highest tin content. Nevertheless, there is no evidence that this difference has a direct connection with the superconducting behavior. A time-dependent splitting was found in the Sn119 spectra of EuBa2(Cu0.8Sn0.2)3O7-y at 78 K. It had a maximum at about 350 h after the synthesis of the sample. Some anomalous temperature dependences were also found in the Eu151 and Sn119 Mössbauer parameters. Our findings can be associated with different Sn sites as well as low-temperature phase transformation in these oxide compounds.

Original languageEnglish
Pages (from-to)328-333
Number of pages6
JournalPhysical Review B
Volume39
Issue number1
DOIs
Publication statusPublished - Jan 1 1989

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ASJC Scopus subject areas

  • Condensed Matter Physics

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