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Hidden Order Parameters and Multipolar Moments in Heavy Fermion Materials

重费米子材料中的隐藏序参数和多极矩

基本信息

批准号：
10640364
负责人：
SHIBA Hiroyuki
金额：
$ 0.96万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640364/
关键词：
quadrupole order octupole moment multipole moment charge order f-electron system heavy fermions 四重極子秩序 CeB_6 quadrupole order octupole moment NMR neutron scattering multipule moment heavy fermion

项目摘要

(1) Importance of AF octupole moment in CeBィイD26ィエD2The interaction between two Ce ions was studies microscopically. Assuming that the mixing between the conduction electrons and the f orbital is the dominant mechanism and the (4f)ィイD10ィエD1state (CeィイD14+ィエD1 is mixed with (4f)ィイD11ィエD1, we showed that the interaction between OィイD2xyィエD2 quadrupoles is the same as the ineraction between TィイD2xyzィエD2 octopoles. Thus the importance of TィイD2xyzィエD2 has been established.(2) Quadrupole order and the nature of AFM state in TmTeTmTe is similar to CeBィイD26ィエD2, showing AF quandrupole order. However the crystal structure and the crystal field effects are different. We constructed a microscopic theory of TmTe. An important consequence is that the AFM moments are canted because of the underlying AFQ order. This was confirmed by a experiment.(3) Change ordered state of YBィイD24ィエD2AsィイD23ィエD2An Effective Hamiltonian was desived to describe low-temperature properties.

(1)在CeB中AF八极矩的重要性。假设传导电子与f轨道的混合是主导机制，(4f) γ γ γ γ γ γ + γ γ γ γ γ与(4f) γ γ γ γ + γ γ γ γ混合，我们证明了O γ γ γ γ γ γ γ γ与T γ γ γ γ γ γ γ γ的相互作用是相同的。因此，T的重要性已经确立。(2) TmTeTmTe的四极序和AFM态性质与CeB γ γ γ γ γ相似，呈AF四极序。但是晶体结构和晶体场效应是不同的。我们建立了TmTe的微观理论。一个重要的结果是，AFM矩是倾斜的，因为潜在的AFQ顺序。实验证实了这一点。(3)建立了描述低温性质的有效哈密顿量（Effective hamilton）。