We present a comparative Mo ̈ssbauer study of the 151Eu motions in the nonsuperconducting and superconducting cuprates EuSr2Cu3O7−δ (ESCO) and EuBa2Cu3O7−δ (EBCO), respec- tively, with the aim of investigating atomic-motion anharmonicities in these materials. In this study, a comparison with the results of a similar analysis of powdered samples of EBCO having oriented grains is also performed. We show that the Eu ion in ESCO, as well as in the common EBCO cuprates, does not move in a parabolic potential, but in a potential with a flat bottom. Moreover, for ESCO the flat part is about 1.5 times larger than for EBCO.
Eu Atomic motion in EuSr2Cu3O7-∂ and EuBa2Cu3O7-∂: A comparative Mössbauer study / L.CIANCHI; F. DEL GIALLO; G. SPINA; E. GILIOLI. - In: JOURNAL OF SUPERCONDUCTIVITY. - ISSN 0896-1107. - STAMPA. - 17:(2004), pp. 409-415.
Eu Atomic motion in EuSr2Cu3O7-∂ and EuBa2Cu3O7-∂: A comparative Mössbauer study
SPINA, GABRIELE;
2004
Abstract
We present a comparative Mo ̈ssbauer study of the 151Eu motions in the nonsuperconducting and superconducting cuprates EuSr2Cu3O7−δ (ESCO) and EuBa2Cu3O7−δ (EBCO), respec- tively, with the aim of investigating atomic-motion anharmonicities in these materials. In this study, a comparison with the results of a similar analysis of powdered samples of EBCO having oriented grains is also performed. We show that the Eu ion in ESCO, as well as in the common EBCO cuprates, does not move in a parabolic potential, but in a potential with a flat bottom. Moreover, for ESCO the flat part is about 1.5 times larger than for EBCO.
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