Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi2(Si0.20Ge0.80)2

Kazuya Yamamoto; Koji Horiba; Munetaka Taguchi; Masaharu Matsunami; Nozomu Kamakura; Yasutaka Takata; Ashish Chainani; Kojiro Mimura; Masayuki Shiga; Hirofumi Wada; Yasunori Senba; Haruhiko Ohashi; Shik Shin

doi:10.1016/j.physb.2006.01.507

Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi₂(Si_0.20Ge_0.80)₂

Kazuya Yamamoto, Koji Horiba, Munetaka Taguchi, Masaharu Matsunami, Nozomu Kamakura, Yasutaka Takata, Ashish Chainani, Kojiro Mimura, Masayuki Shiga, Hirofumi Wada, Yasunori Senba, Haruhiko Ohashi, Shik Shin

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Abstract

We investigate the temperature induced mixed valence transition in EuNi₂(Si_0.2Ge_0.8)₂ using Eu 3d-4f X-ray absorption spectroscopy (XAS). The unoccupied 4f states are studied as a function of temperature (27-120 K), across the critical valence temperature, T_v = 80 K. The Eu 3d-4f X-ray absorption spectra show systematic changes of the mixed valency with temperature. The Eu^{2 +} and Eu^{3 +} spectral features match very well with atomic multiplet calculations. The observed non-integral mean valence changes systematically from ∼ 2.70 ± 0.03 (27 K) to ∼ 2.35 ± 0.03 (120 K), consistent with bulk-sensitive measurements.

Original language	English
Pages (from-to)	681-682
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	378-380
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physb.2006.01.507
Publication status	Published - May 1 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/j.physb.2006.01.507

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Yamamoto, K., Horiba, K., Taguchi, M., Matsunami, M., Kamakura, N., Takata, Y., Chainani, A., Mimura, K., Shiga, M., Wada, H., Senba, Y., Ohashi, H., & Shin, S. (2006). Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi₂(Si_0.20Ge_0.80)₂. Physica B: Condensed Matter, 378-380(SPEC. ISS.), 681-682. https://doi.org/10.1016/j.physb.2006.01.507

Yamamoto, K, Horiba, K, Taguchi, M, Matsunami, M, Kamakura, N, Takata, Y, Chainani, A, Mimura, K, Shiga, M, Wada, H, Senba, Y, Ohashi, H & Shin, S 2006, 'Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi₂(Si_0.20Ge_0.80)₂', Physica B: Condensed Matter, vol. 378-380, no. SPEC. ISS., pp. 681-682. https://doi.org/10.1016/j.physb.2006.01.507

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title = "Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi2(Si0.20Ge0.80)2",

abstract = "We investigate the temperature induced mixed valence transition in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f X-ray absorption spectroscopy (XAS). The unoccupied 4f states are studied as a function of temperature (27-120 K), across the critical valence temperature, Tv = 80 K. The Eu 3d-4f X-ray absorption spectra show systematic changes of the mixed valency with temperature. The Eu2 + and Eu3 + spectral features match very well with atomic multiplet calculations. The observed non-integral mean valence changes systematically from ∼ 2.70 ± 0.03 (27 K) to ∼ 2.35 ± 0.03 (120 K), consistent with bulk-sensitive measurements.",

author = "Kazuya Yamamoto and Koji Horiba and Munetaka Taguchi and Masaharu Matsunami and Nozomu Kamakura and Yasutaka Takata and Ashish Chainani and Kojiro Mimura and Masayuki Shiga and Hirofumi Wada and Yasunori Senba and Haruhiko Ohashi and Shik Shin",

year = "2006",

month = may,

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doi = "10.1016/j.physb.2006.01.507",

language = "English",

volume = "378-380",

pages = "681--682",

journal = "Physica B: Condensed Matter",

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TY - JOUR

T1 - Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi2(Si0.20Ge0.80)2

AU - Yamamoto, Kazuya

AU - Horiba, Koji

AU - Taguchi, Munetaka

AU - Matsunami, Masaharu

AU - Kamakura, Nozomu

AU - Takata, Yasutaka

AU - Chainani, Ashish

AU - Mimura, Kojiro

AU - Shiga, Masayuki

AU - Wada, Hirofumi

AU - Senba, Yasunori

AU - Ohashi, Haruhiko

AU - Shin, Shik

PY - 2006/5/1

Y1 - 2006/5/1

N2 - We investigate the temperature induced mixed valence transition in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f X-ray absorption spectroscopy (XAS). The unoccupied 4f states are studied as a function of temperature (27-120 K), across the critical valence temperature, Tv = 80 K. The Eu 3d-4f X-ray absorption spectra show systematic changes of the mixed valency with temperature. The Eu2 + and Eu3 + spectral features match very well with atomic multiplet calculations. The observed non-integral mean valence changes systematically from ∼ 2.70 ± 0.03 (27 K) to ∼ 2.35 ± 0.03 (120 K), consistent with bulk-sensitive measurements.

AB - We investigate the temperature induced mixed valence transition in EuNi2(Si0.2Ge0.8)2 using Eu 3d-4f X-ray absorption spectroscopy (XAS). The unoccupied 4f states are studied as a function of temperature (27-120 K), across the critical valence temperature, Tv = 80 K. The Eu 3d-4f X-ray absorption spectra show systematic changes of the mixed valency with temperature. The Eu2 + and Eu3 + spectral features match very well with atomic multiplet calculations. The observed non-integral mean valence changes systematically from ∼ 2.70 ± 0.03 (27 K) to ∼ 2.35 ± 0.03 (120 K), consistent with bulk-sensitive measurements.

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U2 - 10.1016/j.physb.2006.01.507

DO - 10.1016/j.physb.2006.01.507

M3 - Article

AN - SCOPUS:33646396189

VL - 378-380

SP - 681

EP - 682

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

IS - SPEC. ISS.

ER -

Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi₂(Si_0.20Ge_0.80)₂

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