Valence transition in polycrystalline Eu(Rh1–xCox)2Si2 studied by hard x-ray photoemission spectroscopy

Katsuya Ichiki; Takayuki Matsumoto; Hiroaki Anzai; Ryohei Takeshita; Kodai Abe; Suzuna Ishihara; Takayuki Uozumi; Hitoshi Sato; Awabaikeli Rousuli; Shigenori Ueda; Yukihiro Taguchi; Kenya Shimada; Hirofumi Namatame; Masaki Taniguchi; Suguru Hamano; Akihiro Mitsuda; Hirofumi Wada; Kojiro Mimura

doi:10.1016/j.elspec.2017.03.014

Valence transition in polycrystalline Eu(Rh_1–xCo_x)₂Si₂ studied by hard x-ray photoemission spectroscopy

Katsuya Ichiki, Takayuki Matsumoto, Hiroaki Anzai, Ryohei Takeshita, Kodai Abe, Suzuna Ishihara, Takayuki Uozumi, Hitoshi Sato, Awabaikeli Rousuli, Shigenori Ueda, Yukihiro Taguchi, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Suguru Hamano, Akihiro Mitsuda, Hirofumi Wada, Kojiro Mimura

Condensed Matter Physics

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

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Abstract

We have investigated bulk-derived electronic structure of the valence transition system Eu(Rh_1–xCo_x)₂Si₂ with x = 0 and 0.4 by means of hard x-ray photoemission spectroscopy. The Eu mean valence evaluated from the Eu 3d spectrum for x = 0.4 gradually changes from 2.57 at 300 K to 2.92 at 20 K. On the other hand, the valence for x = 0 retains ∼2.1 in the temperature range from 300 to 20 K. Furthermore, the Eu²⁺ 4f component in the valence band for x = 0.4 was shifted by 150 meV towards the Fermi level compared to that for x = 0. Present results suggest that the increase in the hybridization strength between Eu 4f and conduction electrons induces the valence transition, which is consistent with the Kondo volume collapse model.

Original language	English
Pages (from-to)	28-32
Number of pages	5
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	220
DOIs	https://doi.org/10.1016/j.elspec.2017.03.014
Publication status	Published - Oct 2017

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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Ichiki, K., Matsumoto, T., Anzai, H., Takeshita, R., Abe, K., Ishihara, S., Uozumi, T., Sato, H., Rousuli, A., Ueda, S., Taguchi, Y., Shimada, K., Namatame, H., Taniguchi, M., Hamano, S., Mitsuda, A., Wada, H., & Mimura, K. (2017). Valence transition in polycrystalline Eu(Rh_1–xCo_x)₂Si₂ studied by hard x-ray photoemission spectroscopy. Journal of Electron Spectroscopy and Related Phenomena, 220, 28-32. https://doi.org/10.1016/j.elspec.2017.03.014

Ichiki, K, Matsumoto, T, Anzai, H, Takeshita, R, Abe, K, Ishihara, S, Uozumi, T, Sato, H, Rousuli, A, Ueda, S, Taguchi, Y, Shimada, K, Namatame, H, Taniguchi, M, Hamano, S, Mitsuda, A, Wada, H & Mimura, K 2017, 'Valence transition in polycrystalline Eu(Rh_1–xCo_x)₂Si₂ studied by hard x-ray photoemission spectroscopy', Journal of Electron Spectroscopy and Related Phenomena, vol. 220, pp. 28-32. https://doi.org/10.1016/j.elspec.2017.03.014

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title = "Valence transition in polycrystalline Eu(Rh1–xCox)2Si2 studied by hard x-ray photoemission spectroscopy",

abstract = "We have investigated bulk-derived electronic structure of the valence transition system Eu(Rh1–xCox)2Si2 with x = 0 and 0.4 by means of hard x-ray photoemission spectroscopy. The Eu mean valence evaluated from the Eu 3d spectrum for x = 0.4 gradually changes from 2.57 at 300 K to 2.92 at 20 K. On the other hand, the valence for x = 0 retains ∼2.1 in the temperature range from 300 to 20 K. Furthermore, the Eu2+ 4f component in the valence band for x = 0.4 was shifted by 150 meV towards the Fermi level compared to that for x = 0. Present results suggest that the increase in the hybridization strength between Eu 4f and conduction electrons induces the valence transition, which is consistent with the Kondo volume collapse model.",

author = "Katsuya Ichiki and Takayuki Matsumoto and Hiroaki Anzai and Ryohei Takeshita and Kodai Abe and Suzuna Ishihara and Takayuki Uozumi and Hitoshi Sato and Awabaikeli Rousuli and Shigenori Ueda and Yukihiro Taguchi and Kenya Shimada and Hirofumi Namatame and Masaki Taniguchi and Suguru Hamano and Akihiro Mitsuda and Hirofumi Wada and Kojiro Mimura",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

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doi = "10.1016/j.elspec.2017.03.014",

language = "English",

volume = "220",

pages = "28--32",

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TY - JOUR

T1 - Valence transition in polycrystalline Eu(Rh1–xCox)2Si2 studied by hard x-ray photoemission spectroscopy

AU - Ichiki, Katsuya

AU - Matsumoto, Takayuki

AU - Anzai, Hiroaki

AU - Takeshita, Ryohei

AU - Abe, Kodai

AU - Ishihara, Suzuna

AU - Uozumi, Takayuki

AU - Sato, Hitoshi

AU - Rousuli, Awabaikeli

AU - Ueda, Shigenori

AU - Taguchi, Yukihiro

AU - Shimada, Kenya

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Hamano, Suguru

AU - Mitsuda, Akihiro

AU - Wada, Hirofumi

AU - Mimura, Kojiro

PY - 2017/10

Y1 - 2017/10

N2 - We have investigated bulk-derived electronic structure of the valence transition system Eu(Rh1–xCox)2Si2 with x = 0 and 0.4 by means of hard x-ray photoemission spectroscopy. The Eu mean valence evaluated from the Eu 3d spectrum for x = 0.4 gradually changes from 2.57 at 300 K to 2.92 at 20 K. On the other hand, the valence for x = 0 retains ∼2.1 in the temperature range from 300 to 20 K. Furthermore, the Eu2+ 4f component in the valence band for x = 0.4 was shifted by 150 meV towards the Fermi level compared to that for x = 0. Present results suggest that the increase in the hybridization strength between Eu 4f and conduction electrons induces the valence transition, which is consistent with the Kondo volume collapse model.

AB - We have investigated bulk-derived electronic structure of the valence transition system Eu(Rh1–xCox)2Si2 with x = 0 and 0.4 by means of hard x-ray photoemission spectroscopy. The Eu mean valence evaluated from the Eu 3d spectrum for x = 0.4 gradually changes from 2.57 at 300 K to 2.92 at 20 K. On the other hand, the valence for x = 0 retains ∼2.1 in the temperature range from 300 to 20 K. Furthermore, the Eu2+ 4f component in the valence band for x = 0.4 was shifted by 150 meV towards the Fermi level compared to that for x = 0. Present results suggest that the increase in the hybridization strength between Eu 4f and conduction electrons induces the valence transition, which is consistent with the Kondo volume collapse model.

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DO - 10.1016/j.elspec.2017.03.014

M3 - Article

AN - SCOPUS:85017190709

SN - 0368-2048

VL - 220

SP - 28

EP - 32

JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

ER -

Valence transition in polycrystalline Eu(Rh_1–xCo_x)₂Si₂ studied by hard x-ray photoemission spectroscopy

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