Temperature-induced valence transition in EuNi2(Si 0.20Ge0.80)2 studied by hard X-ray photoemission spectroscopy

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

doi:10.1016/j.elspec.2005.01.089

Temperature-induced valence transition in EuNi₂(Si _0.20Ge_0.80)₂ studied by hard X-ray photoemission spectroscopy

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

Research output: Contribution to journal › Article › peer-review

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Abstract

The temperature-induced mixed valence transition in EuNi ₂(Si_0.20Ge_0.80)₂ has been investigated by hard X-ray (5940 eV) photoemission spectroscopy (HX-PES) for fractured surfaces, with a probing depth larger than 5 nm. The Eu 3d core-level states are studied below and above the critical valence transition temperature, T_v = 80 K. The HX-PES spectra at 40 and 120 K show the mixed valence transition, with clear changes in the divalent and trivalent Eu 3d chemically shifted 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 accordance with the results of bulk Eu_III-edge X-ray absorption spectroscopy measurements.

Original language	English
Pages (from-to)	553-555
Number of pages	3
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	144-147
DOIs	https://doi.org/10.1016/j.elspec.2005.01.089
Publication status	Published - Jun 1 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Radiation
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry

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10.1016/j.elspec.2005.01.089

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Yamamoto, K., Kamakura, N., Taguchi, M., Chainani, A., Takata, Y., Horiba, K., Shin, S., Ikenaga, E., Mimura, K., Shiga, M., Wada, H., Namatame, H., Taniguchi, M., Awaji, M., Takeuchi, A., Nishino, Y., Miwa, D., Tamasaku, K., Ishikawa, T., & Kobayashi, K. (2005). Temperature-induced valence transition in EuNi₂(Si _0.20Ge_0.80)₂ studied by hard X-ray photoemission spectroscopy. Journal of Electron Spectroscopy and Related Phenomena, 144-147, 553-555. https://doi.org/10.1016/j.elspec.2005.01.089

Yamamoto, K, Kamakura, N, Taguchi, M, Chainani, A, Takata, Y, Horiba, K, Shin, S, Ikenaga, E, Mimura, K, Shiga, M, Wada, H, Namatame, H, Taniguchi, M, Awaji, M, Takeuchi, A, Nishino, Y, Miwa, D, Tamasaku, K, Ishikawa, T & Kobayashi, K 2005, 'Temperature-induced valence transition in EuNi₂(Si _0.20Ge_0.80)₂ studied by hard X-ray photoemission spectroscopy', Journal of Electron Spectroscopy and Related Phenomena, vol. 144-147, pp. 553-555. https://doi.org/10.1016/j.elspec.2005.01.089

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title = "Temperature-induced valence transition in EuNi2(Si 0.20Ge0.80)2 studied by hard X-ray photoemission spectroscopy",

abstract = "The temperature-induced mixed valence transition in EuNi 2(Si0.20Ge0.80)2 has been investigated by hard X-ray (5940 eV) photoemission spectroscopy (HX-PES) for fractured surfaces, with a probing depth larger than 5 nm. The Eu 3d core-level states are studied below and above the critical valence transition temperature, Tv = 80 K. The HX-PES spectra at 40 and 120 K show the mixed valence transition, with clear changes in the divalent and trivalent Eu 3d chemically shifted 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 accordance with the results of bulk EuIII-edge X-ray absorption spectroscopy measurements.",

author = "Kazuya Yamamoto and Nozomu Kamakura and Munetaka Taguchi and Ashish Chainani and Yasutaka Takata and Koji Horiba 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 Kenji Tamasaku and Tetsuya Ishikawa and Keisuke Kobayashi",

year = "2005",

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doi = "10.1016/j.elspec.2005.01.089",

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volume = "144-147",

pages = "553--555",

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TY - JOUR

T1 - Temperature-induced valence transition in EuNi2(Si 0.20Ge0.80)2 studied by hard X-ray photoemission spectroscopy

AU - Yamamoto, Kazuya

AU - Kamakura, Nozomu

AU - Taguchi, Munetaka

AU - Chainani, Ashish

AU - Takata, Yasutaka

AU - Horiba, Koji

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 - Tamasaku, Kenji

AU - Ishikawa, Tetsuya

AU - Kobayashi, Keisuke

PY - 2005/6/1

Y1 - 2005/6/1

N2 - The temperature-induced mixed valence transition in EuNi 2(Si0.20Ge0.80)2 has been investigated by hard X-ray (5940 eV) photoemission spectroscopy (HX-PES) for fractured surfaces, with a probing depth larger than 5 nm. The Eu 3d core-level states are studied below and above the critical valence transition temperature, Tv = 80 K. The HX-PES spectra at 40 and 120 K show the mixed valence transition, with clear changes in the divalent and trivalent Eu 3d chemically shifted 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 accordance with the results of bulk EuIII-edge X-ray absorption spectroscopy measurements.

AB - The temperature-induced mixed valence transition in EuNi 2(Si0.20Ge0.80)2 has been investigated by hard X-ray (5940 eV) photoemission spectroscopy (HX-PES) for fractured surfaces, with a probing depth larger than 5 nm. The Eu 3d core-level states are studied below and above the critical valence transition temperature, Tv = 80 K. The HX-PES spectra at 40 and 120 K show the mixed valence transition, with clear changes in the divalent and trivalent Eu 3d chemically shifted 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 accordance with the results of bulk EuIII-edge X-ray absorption spectroscopy measurements.

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VL - 144-147

SP - 553

EP - 555

JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

ER -

Temperature-induced valence transition in EuNi₂(Si _0.20Ge_0.80)₂ studied by hard X-ray photoemission spectroscopy

Abstract

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