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

doi:10.1143/JPSJ.73.2616

Hard X-ray photoemission spectroscopy of temperature-induced valence transition in EuNi₂(Si_0.20Ge_0.80)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

Condensed Matter Physics

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14 Citations (Scopus)

Abstract

We investigate the temperature-induced mixed valence transition in EuNi₂(Si_0.20Ge_0.80)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, T_v = 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 language	English
Pages (from-to)	2616-2619
Number of pages	4
Journal	journal of the physical society of japan
Volume	73
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.73.2616
Publication status	Published - Oct 2004

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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Yamamoto, K., Taguchi, M., Kamakura, N., Horiba, K., Takata, Y., Chainani, A., Shin, S., Ikenaga, E., Mimura, K., Shiga, M., Wada, H., Namatame, H., Taniguchi, M., Awaji, M., Takeuchi, A., Nishino, Y., Miwa, D., Ishikawa, T., & Kobayashi, K. (2004). Hard X-ray photoemission spectroscopy of temperature-induced valence transition in EuNi₂(Si_0.20Ge_0.80)₂. journal of the physical society of japan, 73(10), 2616-2619. https://doi.org/10.1143/JPSJ.73.2616

Yamamoto, K, Taguchi, M, Kamakura, N, Horiba, K, Takata, Y, Chainani, A, Shin, S, Ikenaga, E, Mimura, K, Shiga, M, Wada, H, Namatame, H, Taniguchi, M, Awaji, M, Takeuchi, A, Nishino, Y, Miwa, D, Ishikawa, T & Kobayashi, K 2004, 'Hard X-ray photoemission spectroscopy of temperature-induced valence transition in EuNi₂(Si_0.20Ge_0.80)₂', journal of the physical society of japan, vol. 73, no. 10, pp. 2616-2619. https://doi.org/10.1143/JPSJ.73.2616

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

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.",

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

year = "2004",

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doi = "10.1143/JPSJ.73.2616",

language = "English",

volume = "73",

pages = "2616--2619",

journal = "journal of the physical society of japan",

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T1 - Hard X-ray photoemission spectroscopy of temperature-induced valence transition in EuNi2(Si0.20Ge0.80)2

AU - Yamamoto, Kazuya

AU - Taguchi, Munetaka

AU - Kamakura, Nozomu

AU - Horiba, Koji

AU - Takata, Yasutaka

AU - Chainani, Ashish

AU - Shin, Shik

AU - Ikenaga, Eiji

AU - Mimura, Kojiro

AU - Shiga, Masayuki

AU - Wada, Hirofumi

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Awaji, Mitsuhiro

AU - Takeuchi, Akihisa

AU - Nishino, Yoshinori

AU - Miwa, Daigo

AU - Ishikawa, Tetsuya

AU - Kobayashi, Keisuke

PY - 2004/10

Y1 - 2004/10

N2 - 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.

AB - 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.

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Hard X-ray photoemission spectroscopy of temperature-induced valence transition in EuNi₂(Si_0.20Ge_0.80)₂

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