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1999•Physical Review LettersRequires access

Spectral Evidence for Pseudogap Formation in Kondo Insulators CeRhAs and CeRhSb

Hiroshi Kumigashira, T. Sato, T. Yokoya, T. Takahashi, Shunsuke Yoshii, M. Kasaya

Open publisher page 61 citations

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 ${T}_{\mathrm{coh}}$ $(<{T}_{K})$. The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.

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What this paper is about

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 ${T}_{\mathrm{coh}}$ $(<{T}_{K})$. The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.

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OpenAlex reports 61 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available 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 ${T}_{\mathrm{coh}}$ $(<{T}_{K})$. The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.

Key concepts: Pseudogap, Kondo insulator, Condensed matter physics, Kondo effect, Physics, Materials science, Quantum mechanics, Cuprate

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