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Crystal electric field excitations in the quasicrystal approximant TbCd_6 studied by inelastic neutron scattering

机译:非弹性中子散射研究准晶体TbCd_6中的晶体电场激发

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摘要

We have performed inelastic neutron scattering measurements on powder samples of the quasicrystal approximant, TbCd_6, grown using isotopically enriched ~(112)Cd. Both quasielastic scattering and distinct inelastic excitations were observed below 3 meV. The intensity of the quasielastic scattering measured in the paramagnetic phase diverges as T_N ~ 22 K is approached from above. The inelastic excitations, and their evolution with temperature, are well characterized by the leading term, B~0_2O~0_2, of the crystal electric field (CEF) level scheme for local pentagonal symmetry for the rare-earth ions [S. Jazbec et al, Phys. Rev. B 93, 054208 (2016)] indicating that the Tb moment is directed primarily along the unique local pseudofivefold axis of the Tsai-type clusters. We also find good agreement between the inverse susceptibility determined from magnetization measurements using a magnetically diluted Tb_(0.05)Y_(0.95)Cd_6 sample and that calculated using the CEF level scheme determined from the neutron measurements.
机译:我们对使用同位素富集的〜(112)Cd生长的准晶体近似值TbCd_6的粉末样品进行了非弹性中子散射测量。低于3 meV观察到准弹性散射和明显的非弹性激发。当从上方接近T_N〜22 K时,在顺磁相中测得的准弹性散射强度发生变化。对于稀土离子,局部五边形对称性的晶体电场(CEF)能级方案的前导项B〜0_2O〜0_2很好地表征了非弹性激发及其随温度的演化[S. Jazbec等人,Phys。 Rev. B 93,054208(2016)]指出,Tb矩主要是沿着Tsai型星团的唯一局部伪五轴指向的。我们还发现,使用磁稀释的Tb_(0.05)Y_(0.95)Cd_6样品从磁化强度测量确定的反磁化率与使用由中子测量确定的CEF水平方案计算的磁化率之间具有良好的一致性。

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  • 来源
    《Physical review》 |2017年第5期|054408.1-054408.6|共6页
  • 作者单位

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    University of Grenoble Alpes, CNRS, SIMAP, 38000 Grenoble, France;

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Department of Materials Science and Technology, Tokyo University of Science, Noda, JP-278-8510, Japan;

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    University of Grenoble Alpes, CNRS, SIMAP, 38000 Grenoble, France;

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, U. S. DOE, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

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