Enhancement of a Scalar Type of Multipole Due to Multiorbital Kondo Effect(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

Enhancement of a Scalar Type of Multipole Due to Multiorbital Kondo Effect(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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多轨道近藤效应对标量型多极子的增强(凝聚态物质:电子结构和电、磁、光特性)

DOI:
10.1143/jpsj.76.074714
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发表时间:
2007
影响因子:
1.7
通讯作者:
M. Matsumoto
M. Matsumoto
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
M. Koga;M. Matsumoto

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对于f2组态的晶场单重态-三重态情况,给出了轨道简并杂质引起的Kondo效应的新特征。在低温下存在两种稳定态:一种是以f2单重态为主的费米液体,另一种是由f2三重态与传导电子之间的四极交换作用稳定的非费米液体。数值重整化群分析表明,这两个态的竞争增强了传导电子与杂质态标量类型的十六极矩的耦合,表明电荷自由度与多轨道情况有关。这一结果支持了高阶多极子在f电子系统中的优越性,例如Pr基填充的Skutterudite化合物。
A new feature of Kondo effect due to an orbitally degenerate impurity is presented for a crystal-field singlet–triplet case in the f 2 configuration. There are two stable states at low temperatures: one is a Fermi-liquid dominated by the f 2 singlet; the other is a non-Fermi liquid stabilized by a quadrupolar type of exchange interaction between the f 2 triplet and conduction electrons. The numerical renormalization group analysis shows that the competition of both states strongly enhances a coupling of conduction electrons with a scalar type of hexadecapolar moment of the impurity state, indicating that the charge degrees of freedom is relevant for the multiorbital case. This result supports the superiority of high-rank multipoles in f -electron systems such as the Pr-based filled skutterudite compounds.
f^2晶体电场单重态-三重态构型中重局域费米液体和非费米液体的实现
DOI: --
发表时间: 2005
期刊: Journal of the Physical Society of Japan 74
影响因子: --
作者:
K.Hattori;et al.
通讯作者: et al.
在填充方钴矿结构中实现新的近藤行为
DOI: --
发表时间: 2005
期刊: J.Phys.Soc.Jpn. 74
影响因子: --
作者:
Y.Aoki;H.Sugawara;H.Harima;H.Sato
通讯作者: H.Sato