Photoemission evidence for valence fluctuations and Kondo resonance in YbAl 2

Masaharu Matsunami; Ashish Chainani; Munetaka Taguchi; Ritsuko Eguchi; Yasutaka Takata; Masaki Oura; Makina Yabashi; Kenji Tamasaku; Yoshinori Nishino; Tetsuya Ishikawa; Masashi Kosaka; Shik Shin

doi:10.1143/JPSJ.81.073702

Photoemission evidence for valence fluctuations and Kondo resonance in YbAl ₂

Masaharu Matsunami, Ashish Chainani, Munetaka Taguchi, Ritsuko Eguchi, Yasutaka Takata, Masaki Oura, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, Tetsuya Ishikawa, Masashi Kosaka, Shik Shin

Department of Physics

Research output: Contribution to journal › Review article › peer-review

6 Citations (Scopus)

Abstract

We use hard x-ray photoemission spectroscopy (HAXPES) to investigate the electronic structure of YbAl ₂, for which the Yb valence has not been consistently reported to date. The bulk sensitivity and the analytical simplicity provided by the Yb 3d core-level HAXPES allow a reliable determination of the mean valence of Yb ions. For YbAl ₂, it is evaluated to be +2.20, which remains nearly unchanged below 300 K. The Kondo resonance peak with an extremely high Kondo temperature (above 2000 K) is clearly identified in the valence-band spectra. The results indicate that a coherent Kondo state can be robust even in a nearly divalent system.

Original language	English
Article number	073702
Journal	Journal of the Physical Society of Japan
Volume	81
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.81.073702
Publication status	Published - 2012 Jul

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJ.81.073702

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@article{e90f3588c27f4c3f9ed266be7ba7e490,

title = "Photoemission evidence for valence fluctuations and Kondo resonance in YbAl 2 ",

abstract = "We use hard x-ray photoemission spectroscopy (HAXPES) to investigate the electronic structure of YbAl 2, for which the Yb valence has not been consistently reported to date. The bulk sensitivity and the analytical simplicity provided by the Yb 3d core-level HAXPES allow a reliable determination of the mean valence of Yb ions. For YbAl 2, it is evaluated to be +2.20, which remains nearly unchanged below 300 K. The Kondo resonance peak with an extremely high Kondo temperature (above 2000 K) is clearly identified in the valence-band spectra. The results indicate that a coherent Kondo state can be robust even in a nearly divalent system.",

author = "Masaharu Matsunami and Ashish Chainani and Munetaka Taguchi and Ritsuko Eguchi and Yasutaka Takata and Masaki Oura and Makina Yabashi and Kenji Tamasaku and Yoshinori Nishino and Tetsuya Ishikawa and Masashi Kosaka and Shik Shin",

year = "2012",

month = jul,

doi = "10.1143/JPSJ.81.073702",

language = "English",

volume = "81",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

number = "7",

}

Photoemission evidence for valence fluctuations and Kondo resonance in YbAl ₂ . / Matsunami, Masaharu; Chainani, Ashish; Taguchi, Munetaka; Eguchi, Ritsuko; Takata, Yasutaka; Oura, Masaki; Yabashi, Makina; Tamasaku, Kenji; Nishino, Yoshinori; Ishikawa, Tetsuya; Kosaka, Masashi; Shin, Shik.

In: Journal of the Physical Society of Japan, Vol. 81, No. 7, 073702, 07.2012.

Research output: Contribution to journal › Review article › peer-review

TY - JOUR

T1 - Photoemission evidence for valence fluctuations and Kondo resonance in YbAl 2

AU - Matsunami, Masaharu

AU - Chainani, Ashish

AU - Taguchi, Munetaka

AU - Eguchi, Ritsuko

AU - Takata, Yasutaka

AU - Oura, Masaki

AU - Yabashi, Makina

AU - Tamasaku, Kenji

AU - Nishino, Yoshinori

AU - Ishikawa, Tetsuya

AU - Kosaka, Masashi

AU - Shin, Shik

PY - 2012/7

Y1 - 2012/7

N2 - We use hard x-ray photoemission spectroscopy (HAXPES) to investigate the electronic structure of YbAl 2, for which the Yb valence has not been consistently reported to date. The bulk sensitivity and the analytical simplicity provided by the Yb 3d core-level HAXPES allow a reliable determination of the mean valence of Yb ions. For YbAl 2, it is evaluated to be +2.20, which remains nearly unchanged below 300 K. The Kondo resonance peak with an extremely high Kondo temperature (above 2000 K) is clearly identified in the valence-band spectra. The results indicate that a coherent Kondo state can be robust even in a nearly divalent system.

AB - We use hard x-ray photoemission spectroscopy (HAXPES) to investigate the electronic structure of YbAl 2, for which the Yb valence has not been consistently reported to date. The bulk sensitivity and the analytical simplicity provided by the Yb 3d core-level HAXPES allow a reliable determination of the mean valence of Yb ions. For YbAl 2, it is evaluated to be +2.20, which remains nearly unchanged below 300 K. The Kondo resonance peak with an extremely high Kondo temperature (above 2000 K) is clearly identified in the valence-band spectra. The results indicate that a coherent Kondo state can be robust even in a nearly divalent system.

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U2 - 10.1143/JPSJ.81.073702

DO - 10.1143/JPSJ.81.073702

M3 - Review article

AN - SCOPUS:84863565389

VL - 81

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 7

M1 - 073702

ER -

Photoemission evidence for valence fluctuations and Kondo resonance in YbAl ₂

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