Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2

K. Yamamoto; K. Horiba; M. Taguchi; M. Matsunami; N. Kamakura; A. Chainani; Y. Takata; K. Mimura; M. Shiga; H. Wada; Y. Senba; H. Ohashi; S. Shin

doi:10.1103/PhysRevB.72.161101

Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2

K. Yamamoto, K. Horiba, M. Taguchi, M. Matsunami, N. Kamakura, A. Chainani, Y. Takata, K. Mimura, M. Shiga, H. Wada, Y. Senba, H. Ohashi, S. Shin

物理學系

研究成果: Article › 同行評審

19 引文斯高帕斯（Scopus）

摘要

We study the mixed valence transition (Tv∼80K) in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f x-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu2+ and Eu3+ main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature (T) dependent changes over large energies (∼10eV) in RESPES and XAS. The observed nonintegral mean valencies of ∼2.35±0.03(T=120K) and ∼2.70±0.03(T=40K) indicate homogeneous mixed valence above and below Tv. The redistribution between Eu2+4f7+[spd]0 and Eu3+4f6+[spd]1 states is attributed to a hybridization change coupled to a Kondo-like volume collapse.

原文	English
文章編號	161101
期刊	Physical Review B - Condensed Matter and Materials Physics
卷	72
發行號	16
DOIs	https://doi.org/10.1103/PhysRevB.72.161101
出版狀態	Published - 2005 10月 15

All Science Journal Classification (ASJC) codes

電子、光磁材料
凝聚態物理學

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10.1103/PhysRevB.72.161101

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Yamamoto, K., Horiba, K., Taguchi, M., Matsunami, M., Kamakura, N., Chainani, A., Takata, Y., Mimura, K., Shiga, M., Wada, H., Senba, Y., Ohashi, H., & Shin, S. (2005). Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2. Physical Review B - Condensed Matter and Materials Physics, 72(16), [161101]. https://doi.org/10.1103/PhysRevB.72.161101

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abstract = "We study the mixed valence transition (Tv∼80K) in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f x-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu2+ and Eu3+ main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature (T) dependent changes over large energies (∼10eV) in RESPES and XAS. The observed nonintegral mean valencies of ∼2.35±0.03(T=120K) and ∼2.70±0.03(T=40K) indicate homogeneous mixed valence above and below Tv. The redistribution between Eu2+4f7+[spd]0 and Eu3+4f6+[spd]1 states is attributed to a hybridization change coupled to a Kondo-like volume collapse.",

author = "K. Yamamoto and K. Horiba and M. Taguchi and M. Matsunami and N. Kamakura and A. Chainani and Y. Takata and K. Mimura and M. Shiga and H. Wada and Y. Senba and H. Ohashi and S. Shin",

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Yamamoto, K, Horiba, K, Taguchi, M, Matsunami, M, Kamakura, N, Chainani, A, Takata, Y, Mimura, K, Shiga, M, Wada, H, Senba, Y, Ohashi, H & Shin, S 2005, 'Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2', Physical Review B - Condensed Matter and Materials Physics, 卷 72, 編號 16, 161101. https://doi.org/10.1103/PhysRevB.72.161101

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T1 - Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2

AU - Yamamoto, K.

AU - Horiba, K.

AU - Taguchi, M.

AU - Matsunami, M.

AU - Kamakura, N.

AU - Chainani, A.

AU - Takata, Y.

AU - Mimura, K.

AU - Shiga, M.

AU - Wada, H.

AU - Senba, Y.

AU - Ohashi, H.

AU - Shin, S.

PY - 2005/10/15

Y1 - 2005/10/15

N2 - We study the mixed valence transition (Tv∼80K) in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f x-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu2+ and Eu3+ main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature (T) dependent changes over large energies (∼10eV) in RESPES and XAS. The observed nonintegral mean valencies of ∼2.35±0.03(T=120K) and ∼2.70±0.03(T=40K) indicate homogeneous mixed valence above and below Tv. The redistribution between Eu2+4f7+[spd]0 and Eu3+4f6+[spd]1 states is attributed to a hybridization change coupled to a Kondo-like volume collapse.

AB - We study the mixed valence transition (Tv∼80K) in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f x-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu2+ and Eu3+ main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature (T) dependent changes over large energies (∼10eV) in RESPES and XAS. The observed nonintegral mean valencies of ∼2.35±0.03(T=120K) and ∼2.70±0.03(T=40K) indicate homogeneous mixed valence above and below Tv. The redistribution between Eu2+4f7+[spd]0 and Eu3+4f6+[spd]1 states is attributed to a hybridization change coupled to a Kondo-like volume collapse.

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Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valence transition in EuNi2(Si0.2Ge0.8)2

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