Hard X-ray photoemission spectroscopy of temperature-induced valence transition in EuNi2(Si0.20Ge0.80)2

Kazuya Yamamoto, Munetaka Taguchi, Nozomu Kamakura, Koji Horiba, Yasutaka Takata, Ashish Chainani, Shik Shin, Eiji Ikenaga, Kojiro Mimura, Masayuki Shiga, Hirofumi Wada, Hirofumi Namatame, Masaki Taniguchi, Mitsuhiro Awaji, Akihisa Takeuchi, Yoshinori Nishino, Daigo Miwa, Tetsuya Ishikawa, Keisuke Kobayashi

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13 Citations (Scopus)

Abstract

We investigate the temperature-induced mixed valence transition in EuNi2(Si0.20Ge0.80)2 using Hard X-ray (5940 eV) photoemission spectroscopy (HX-PES), with a probing depth larger than 5 nm. The Eu 3d, Ni 2p and Ge 2p core-level states are studied below and above the critical valence transition temperature, Tv = 80 K. HX-PES spectra at 40 K and 120 K show the mixed valence transition, with clear changes in the divalent and trivalent Eu 3d chemically shifted features, and negligible changes in the Ni 2p and Ge 2p states. The Eu 3d spectral shapes match very well with the results of the atomic calculations of the Eu2+ and Eu 3+ configurations, confirming intra-atomic multiplet features. The Eu 3d HX-PES spectra indicate a mean valence of 2.70 ± 0.03 at 40 K which changes to 2.40 ± 0.03 at 120 K, in good accord with the results of bulk Eu L-edge X-ray absorption spectroscopy measurements.

Original languageEnglish
Pages (from-to)2616-2619
Number of pages4
Journaljournal of the physical society of japan
Volume73
Issue number10
DOIs
Publication statusPublished - Oct 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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