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

Tohoku University

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

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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 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.

Original language	English
Pages (from-to)	735-740
Number of pages	6
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	114-116
DOIs	https://doi.org/10.1016/S0368-2048(00)00386-8
Publication status	Published - 2001 Mar
Event	8th International Conference on Electronic Spectroscopy and Structure (ICESS-8) - Berkeley, CA, USA Duration: 2000 Aug 8 → 2000 Aug 12

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@article{ed5edab5ea7d44ada9d0c60c182b6be8,

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",

year = "2001",

month = mar,

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

language = "English",

volume = "114-116",

pages = "735--740",

journal = "Journal of Electron Spectroscopy and Related Phenomena",

issn = "0368-2048",

publisher = "Elsevier B.V.",

}

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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UR - http://www.scopus.com/inward/citedby.url?scp=0035276954&partnerID=8YFLogxK

U2 - 10.1016/S0368-2048(00)00386-8

DO - 10.1016/S0368-2048(00)00386-8

M3 - Conference article

AN - SCOPUS:0035276954

SN - 0368-2048

VL - 114-116

SP - 735

EP - 740

JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

Y2 - 8 August 2000 through 12 August 2000

ER -

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

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