Application of Eu-151 Mössbauer Spectroscopy to Studies of Electric Field Gradients in High-temperature Superconductors

J. Lindén, T. Karlemo, Maarit Karppinen, Toivo Katila, Mikk Lippmaa, Akiko Nara, L. Niinistö, Ilkka Tittonen, K. Ullakko, Hisao Yamauchi

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The rare-earth site of samples having the compositions (Fe,Cu)Sr2(Eu,Ce)nCu2O4+2 n+z (n=2 and 3) were studied by151Eu Mössbauer spectroscopy. The results obtained are compared with measurements of EuBa2Cu3O7-δ (1:2:3) and Bi2Sr2(Ca1-yEuy)Cu2O8+E (2:2:1:2) samples. The full quadrupole Hamiltonian of the 21.5-keV γ-transition was applied in analyzing the measured spectra. Simultaneous fitting of spectra recorded from crystallites oriented in various directions was used to determine the hyperfine parameters of the n= 2 and 3 samples. Two different electric field gradients, not discernible in simple random crystallite measurements, were obtained for the n=3 series. © 1994 J.C. Baltzer AG, Science Publishers.
Original languageEnglish
Pages (from-to)1635-1639
JournalHyperfine Interactions
Volume93
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

Keywords

  • Eu-151
  • High-Tc superconductors
  • Mössbauer spectroscopy

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