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

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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.

Original language	English
Article number	161101
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.72.161101
Publication status	Published - Oct 15 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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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

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, vol. 72, no. 16, 161101. https://doi.org/10.1103/PhysRevB.72.161101

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

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",

year = "2005",

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doi = "10.1103/PhysRevB.72.161101",

language = "English",

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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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DO - 10.1103/PhysRevB.72.161101

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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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