High-Tc superconductors studied by57Co,57Fe,119Sn, and151Eu mössbauer spectroscopy

E. Kuzmann, Sándor Nagy, Z. Homonnay, A. Vértes, István Halász, Miklós Gál, Béla Csákvári, Kornél Torkos, József Bánkúti, István Kirschner, Yen Wei, Amar Nath

Research output: Contribution to journalArticle

Abstract

151Eu,119Sn,57Fe, and57Co Mössbauer spectroscopy was used to study YBa2Cu3O7-δ high-Tc superconductors in which sites were replaced by various Mössbauer nuclides in order to get information about site preference and structural changes. By decomposition of the Mössbauer spectra, the Y site substituted by Eu and the Cu sites occupied by Sn, Fe, and Co substituents were identified. It was found that Fe and Co prefer the Cu(1) site while Sn prefers the Cu(2) site in the orthorhombic perovskite lattice of these superconductors. The site preference is enhanced in the presence of additional substituents. A sequence of thermal heat treatments permits reversible cycling of57Co between the two copper sites in the YBa2[Cu(57Co)]3O7-δ perovskite. In all cases Eu(III) and Sn(IV) states are determined, but the valence state of Fe and Co can be both three and four. Below Tc, low-temperature phase transformation and phonon softening were shown from the anomalous temperature dependence of isomer shifts and the area fractions of151Eu and119Sn Mössbauer spectra of EuBa2(Cu1-xSnx)3O7- δ cuprates.

Original languageEnglish
JournalStructural Chemistry
Volume2
Issue number3-4
DOIs
Publication statusPublished - Jan 1991

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Superconducting materials
Spectrum Analysis
Hot Temperature
Phonons
Spectroscopy
Temperature
nuclides
Isomers
softening
spectroscopy
cuprates
Isotopes
phase transformations
Copper
heat treatment
isomers
Phase transitions
Heat treatment
Decomposition
valence

ASJC Scopus subject areas

  • Chemistry(all)
  • Structural Biology

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High-Tc superconductors studied by57Co,57Fe,119Sn, and151Eu mössbauer spectroscopy. / Kuzmann, E.; Nagy, Sándor; Homonnay, Z.; Vértes, A.; Halász, István; Gál, Miklós; Csákvári, Béla; Torkos, Kornél; Bánkúti, József; Kirschner, István; Wei, Yen; Nath, Amar.

In: Structural Chemistry, Vol. 2, No. 3-4, 01.1991.

Research output: Contribution to journalArticle

Kuzmann, E, Nagy, S, Homonnay, Z, Vértes, A, Halász, I, Gál, M, Csákvári, B, Torkos, K, Bánkúti, J, Kirschner, I, Wei, Y & Nath, A 1991, 'High-Tc superconductors studied by57Co,57Fe,119Sn, and151Eu mössbauer spectroscopy', Structural Chemistry, vol. 2, no. 3-4. https://doi.org/10.1007/BF00672222
Kuzmann, E. ; Nagy, Sándor ; Homonnay, Z. ; Vértes, A. ; Halász, István ; Gál, Miklós ; Csákvári, Béla ; Torkos, Kornél ; Bánkúti, József ; Kirschner, István ; Wei, Yen ; Nath, Amar. / High-Tc superconductors studied by57Co,57Fe,119Sn, and151Eu mössbauer spectroscopy. In: Structural Chemistry. 1991 ; Vol. 2, No. 3-4.
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