Spectral evidence for pseudogap formation in kondo insulators CeRhAs and CeRhSb

H. Kumigashira; T. Sato; T. Yokoya; T. Takahashi; S. Yoshii; M. Kasaya

doi:10.1103/PhysRevLett.82.1943

Spectral evidence for pseudogap formation in kondo insulators CeRhAs and CeRhSb

H. Kumigashira, T. Sato, T. Yokoya, T. Takahashi, S. Yoshii, M. Kasaya

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Abstract

High-resolution photoemission spectroscopy has been performed on CeRhAs and CeRhSb to study the temperature-induced evolution of the “Kondo-insulator” gap. We have observed that a pseudogap opens at E_F at low temperatures while it is gradually filled with increasing temperature. The size of the pseudogap is well scaled with the Kondo temperature (T_K) of each compound while the temperature evolution is dominated by another characteristic temperature T_coh (<T_K). The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.

Original language	English
Pages (from-to)	1943-1946
Number of pages	4
Journal	Physical Review Letters
Volume	82
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.82.1943
Publication status	Published - Jan 1 1999
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.82.1943

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abstract = "High-resolution photoemission spectroscopy has been performed on CeRhAs and CeRhSb to study the temperature-induced evolution of the “Kondo-insulator” gap. We have observed that a pseudogap opens at EF at low temperatures while it is gradually filled with increasing temperature. The size of the pseudogap is well scaled with the Kondo temperature (TK) of each compound while the temperature evolution is dominated by another characteristic temperature Tcoh (<TK). The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.",

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AU - Sato, T.

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AU - Yoshii, S.

AU - Kasaya, M.

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AB - High-resolution photoemission spectroscopy has been performed on CeRhAs and CeRhSb to study the temperature-induced evolution of the “Kondo-insulator” gap. We have observed that a pseudogap opens at EF at low temperatures while it is gradually filled with increasing temperature. The size of the pseudogap is well scaled with the Kondo temperature (TK) of each compound while the temperature evolution is dominated by another characteristic temperature Tcoh (<TK). The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.

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Spectral evidence for pseudogap formation in kondo insulators CeRhAs and CeRhSb

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