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  1. 050 理学部
  2. 10 学術雑誌論文
  3. 10 査読済論文
  1. 0 資料タイプ別
  2. 01 学術雑誌論文

Dynamical mean-field theory for the anisotropic Kondo semiconductor : Temperature and magnetic field dependence

http://hdl.handle.net/10191/26866
http://hdl.handle.net/10191/26866
94008763-7c79-4414-bfb2-fe4508fd6b6f
名前 / ファイル ライセンス アクション
85(16)_165114.pdf 85(16)_165114.pdf (756.0 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2014-04-15
タイトル
タイトル Dynamical mean-field theory for the anisotropic Kondo semiconductor : Temperature and magnetic field dependence
タイトル
言語 en
タイトル Dynamical mean-field theory for the anisotropic Kondo semiconductor : Temperature and magnetic field dependence
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Yamada, Takemi

× Yamada, Takemi

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Yamada, Takemi

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Ono, Yoshiaki

× Ono, Yoshiaki

WEKO 62

Ono, Yoshiaki

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抄録
内容記述タイプ Abstract
内容記述 We investigate the periodic Anderson model with k-dependent c-f mixing reproducing the point nodes of the hybridization gap by using the dynamical mean-field theory combined with the exact diagonalization method. At low temperature below a coherence temperature T0, the imaginary part of the self-energy is found to be proportional to T 2 and the pseudogap with two characteristic energies Δ1 and Δ2 is clearly observed for T << T0, while the pseudogap is smeared with increasing T and then disappears at high temperature T > T0 due to the evolution of the imaginary self-energy. When the Coulomb interaction between f electrons U increases, Δ1, Δ2, and T0 together with Tmax at which the magnetic susceptibility is maximum decrease in proportion to the renormalization factor Z resulting in a heavy-fermion semiconductor with a large mass enhancement m∗ /m = Z -1 for large U. We also examine the effect of the external magnetic field H and find that the magnetizationM shows two metamagnetic anomalies H1 and H2 corresponding toΔ1 and Δ2 which are reduced due to the effect of H together with Z. Remarkably, Z −1 is found to be largely enhanced due to H especially for H1< H < H2, where the field induced heavy fermion state is realized. The obtained results seem to be consistent with the experimental results observed in the anisotropic Kondo semiconductors such as CeNiSn.
書誌情報 Physical review. Third series. B, Condensed matter and materials physics
en : Physical review. Third series. B, Condensed matter and materials physics

巻 85, 号 16, p. 165114-1-165114-10, 発行日 2012-04
出版者
出版者 American Physical Society
ISSN
収録物識別子タイプ ISSN
収録物識別子 10980121
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA11187113
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1103/PhysRevB.85.165114
権利
権利情報 Copyright (C) 2012 The American Physical Society
著者版フラグ
値 publisher
異版である
関連タイプ isVersionOf
識別子タイプ URI
関連識別子 http://journals.aps.org/prb/pdf/10.1103/PhysRevB.85.165114
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