Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants

M. Matsunami; M. Oura; K. Tamasaku; T. Ishikawa; S. Ideta; K. Tanaka; T. Takeuchi; T. Yamada; A. P. Tsai; K. Imura; K. Deguchi; N. K. Sato; T. Ishimasa

doi:10.1103/PhysRevB.96.241102

Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants

M. Matsunami, M. Oura, K. Tamasaku, T. Ishikawa, S. Ideta, K. Tanaka, T. Takeuchi, T. Yamada, A. P. Tsai, K. Imura, K. Deguchi, N. K. Sato, T. Ishimasa

Center for Exploration of New Inorganic Materials

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

3 Citations (Scopus)

Abstract

We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au64Ge22Yb14 (AGY-I), Au63.5Ge20.5Yb16 (AGY-II), and Zn85.4Yb14.6 (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4f state and a valence fluctuation derived Kondo resonance peak, reflecting two inequivalent Yb sites, a single Yb atom in the cluster center and its surrounding Yb icosahedron, respectively. The fully occupied 4f signal is absent in AGY-I containing no Yb atom in the cluster center. The results provide direct evidence for a heterogeneous valence state in AGY-II and Zn-Yb.

Original language	English
Article number	241102
Journal	Physical Review B
Volume	96
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.96.241102
Publication status	Published - 2017 Dec 11

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants. / Matsunami, M.; Oura, M.; Tamasaku, K.; Ishikawa, T.; Ideta, S.; Tanaka, K.; Takeuchi, T.; Yamada, T.; Tsai, A. P.; Imura, K.; Deguchi, K.; Sato, N. K.; Ishimasa, T.

In: Physical Review B, Vol. 96, No. 24, 241102, 11.12.2017.

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

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title = "Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants",

abstract = "We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au64Ge22Yb14 (AGY-I), Au63.5Ge20.5Yb16 (AGY-II), and Zn85.4Yb14.6 (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4f state and a valence fluctuation derived Kondo resonance peak, reflecting two inequivalent Yb sites, a single Yb atom in the cluster center and its surrounding Yb icosahedron, respectively. The fully occupied 4f signal is absent in AGY-I containing no Yb atom in the cluster center. The results provide direct evidence for a heterogeneous valence state in AGY-II and Zn-Yb.",

author = "M. Matsunami and M. Oura and K. Tamasaku and T. Ishikawa and S. Ideta and K. Tanaka and T. Takeuchi and T. Yamada and Tsai, {A. P.} and K. Imura and K. Deguchi and Sato, {N. K.} and T. Ishimasa",

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AU - Matsunami, M.

AU - Oura, M.

AU - Tamasaku, K.

AU - Ishikawa, T.

AU - Ideta, S.

AU - Tanaka, K.

AU - Takeuchi, T.

AU - Yamada, T.

AU - Tsai, A. P.

AU - Imura, K.

AU - Deguchi, K.

AU - Sato, N. K.

AU - Ishimasa, T.

PY - 2017/12/11

Y1 - 2017/12/11

N2 - We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au64Ge22Yb14 (AGY-I), Au63.5Ge20.5Yb16 (AGY-II), and Zn85.4Yb14.6 (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4f state and a valence fluctuation derived Kondo resonance peak, reflecting two inequivalent Yb sites, a single Yb atom in the cluster center and its surrounding Yb icosahedron, respectively. The fully occupied 4f signal is absent in AGY-I containing no Yb atom in the cluster center. The results provide direct evidence for a heterogeneous valence state in AGY-II and Zn-Yb.

AB - We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au64Ge22Yb14 (AGY-I), Au63.5Ge20.5Yb16 (AGY-II), and Zn85.4Yb14.6 (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4f state and a valence fluctuation derived Kondo resonance peak, reflecting two inequivalent Yb sites, a single Yb atom in the cluster center and its surrounding Yb icosahedron, respectively. The fully occupied 4f signal is absent in AGY-I containing no Yb atom in the cluster center. The results provide direct evidence for a heterogeneous valence state in AGY-II and Zn-Yb.

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