Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi2(SiO.20Ge0.80)2

We investigate the temperature induced mixed valence transition in EuNi2(SiO.2Ge0.8)2 using Eu 3d-4f X-ray absorption spectroscopy (XAS). The unoccupied 4f states are studied as a function of temperature (27-120K), across the critical valence temperature, . The Eu 3d-4f X-ray absorption spectra show...

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Published inPhysica. B, Condensed matter Vol. 378-380; pp. 681 - 682
Main Authors Yamamoto, Kazuya, Horiba, Koji, Taguchi, Munetaka, Matsunami, Masaharu, Kamakura, Nozomu, Takata, Yasutaka, Chainani, Ashish, Mimura, Kojiro, Shiga, Masayuki, Wada, Hirofumi, Senba, Yasunori, Ohashi, Haruhiko, Shin, Shik
Format Journal Article
LanguageEnglish
Published 01.05.2006
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Summary:We investigate the temperature induced mixed valence transition in EuNi2(SiO.2Ge0.8)2 using Eu 3d-4f X-ray absorption spectroscopy (XAS). The unoccupied 4f states are studied as a function of temperature (27-120K), across the critical valence temperature, . The Eu 3d-4f X-ray absorption spectra show systematic changes of the mixed valency with temperature. The Eu2+ and Eu3+ spectral features match very well with atomic multiplet calculations. The observed non-integral mean valence changes systematically from 2.70+/-0.03 (27K) to 2.35+/-0.03 (120K), consistent with bulk-sensitive measurements.
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ISSN:0921-4526
DOI:10.1016/j.physb.2006.01.507