Ultrahigh-resolution photoemission study of CePd3: Absence of Kondo insulator gap

S. Souma; H. Kumigashira; T. Ito; T. Takahashi; M. Kasaya

doi:10.1016/S0368-2048(00)00386-8

Ultrahigh-resolution photoemission study of CePd₃: Absence of Kondo insulator gap

S. Souma, H. Kumigashira, T. Ito, T. Takahashi, M. Kasaya

多元物質科学研究所・無機材料研究部門

研究成果: Conference article › 査読

1 被引用数 (Scopus)

抄録

We have performed ultrahigh-resolution (ΔE = 8 meV) photoemission spectroscopy to examine the possibility of CePd₃ being a `Kondo insulator' as suggested by a recent optical measurement. We found that the photoemission spectrum of CePd₃ does not show any indication of (pseudo) gap at E_F, differing from the well-established temperature-dependent (pseudo) gap in Kondo insulators. The Ce 4f spectrum clearly shows the `Kondo resonance peak' at E_F, indicating the intrinsic metallic nature of CePd₃. These results strongly suggest that CePd₃ is not a Kondo insulator but a conventional Kondo metal as suggested by thermodynamic measurements.

本文言語	English
ページ（範囲）	735-740
ページ数	6
ジャーナル	Journal of Electron Spectroscopy and Related Phenomena
巻	114-116
DOI	https://doi.org/10.1016/S0368-2048(00)00386-8
出版ステータス	Published - 2001 3月
イベント	8th International Conference on Electronic Spectroscopy and Structure (ICESS-8) - Berkeley, CA, USA 継続期間: 2000 8月 8 → 2000 8月 12

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
放射線
原子分子物理学および光学
凝縮系物理学
分光学
物理化学および理論化学

文献へのアクセス

10.1016/S0368-2048(00)00386-8

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引用スタイル

@article{d64288000ec94cd3b373284302d0b165,

title = "Ultrahigh-resolution photoemission study of CePd3: Absence of Kondo insulator gap",

abstract = "We have performed ultrahigh-resolution (ΔE = 8 meV) photoemission spectroscopy to examine the possibility of CePd3 being a `Kondo insulator' as suggested by a recent optical measurement. We found that the photoemission spectrum of CePd3 does not show any indication of (pseudo) gap at EF, differing from the well-established temperature-dependent (pseudo) gap in Kondo insulators. The Ce 4f spectrum clearly shows the `Kondo resonance peak' at EF, indicating the intrinsic metallic nature of CePd3. These results strongly suggest that CePd3 is not a Kondo insulator but a conventional Kondo metal as suggested by thermodynamic measurements.",

author = "S. Souma and H. Kumigashira and T. Ito and T. Takahashi and M. Kasaya",

note = "Funding Information: The authors thank Professor Y. Kuramoto for his useful discussion. H.K. and T.I. thank the Japan Society for the Promotion of Science for financial support. This work was supported by a grant from the Ministry of Education, Science and Culture of Japan.; 8th International Conference on Electronic Spectroscopy and Structure (ICESS-8) ; Conference date: 08-08-2000 Through 12-08-2000",

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doi = "10.1016/S0368-2048(00)00386-8",

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TY - JOUR

T1 - Ultrahigh-resolution photoemission study of CePd3

T2 - 8th International Conference on Electronic Spectroscopy and Structure (ICESS-8)

AU - Souma, S.

AU - Kumigashira, H.

AU - Ito, T.

AU - Takahashi, T.

AU - Kasaya, M.

N1 - Funding Information: The authors thank Professor Y. Kuramoto for his useful discussion. H.K. and T.I. thank the Japan Society for the Promotion of Science for financial support. This work was supported by a grant from the Ministry of Education, Science and Culture of Japan.

PY - 2001/3

Y1 - 2001/3

N2 - We have performed ultrahigh-resolution (ΔE = 8 meV) photoemission spectroscopy to examine the possibility of CePd3 being a `Kondo insulator' as suggested by a recent optical measurement. We found that the photoemission spectrum of CePd3 does not show any indication of (pseudo) gap at EF, differing from the well-established temperature-dependent (pseudo) gap in Kondo insulators. The Ce 4f spectrum clearly shows the `Kondo resonance peak' at EF, indicating the intrinsic metallic nature of CePd3. These results strongly suggest that CePd3 is not a Kondo insulator but a conventional Kondo metal as suggested by thermodynamic measurements.

AB - We have performed ultrahigh-resolution (ΔE = 8 meV) photoemission spectroscopy to examine the possibility of CePd3 being a `Kondo insulator' as suggested by a recent optical measurement. We found that the photoemission spectrum of CePd3 does not show any indication of (pseudo) gap at EF, differing from the well-established temperature-dependent (pseudo) gap in Kondo insulators. The Ce 4f spectrum clearly shows the `Kondo resonance peak' at EF, indicating the intrinsic metallic nature of CePd3. These results strongly suggest that CePd3 is not a Kondo insulator but a conventional Kondo metal as suggested by thermodynamic measurements.

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JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

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