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- W3216524979 abstract "We report the results of dc magnetization, thermal expansion, and magnetostriction measurements of the Kondo semiconductor ${mathrm{CeOs}}_{4}{mathrm{Sb}}_{12}$. These results provide a magnetic-field--temperature phase diagram for the three principal axes of the cubic crystal [100], [110], and [111] and reveal the magnetic anisotropy of the three ordered phases A, B, and C. The magnetic anisotropy of the transition temperature ${T}_{mathrm{C}}$ from the paramagnetic phase to the C phase is ${T}_{mathrm{C}}^{[111]}>{T}_{mathrm{C}}^{[110]}>{T}_{mathrm{C}}^{[100]}$. At low temperatures, the magnetization has a distinct magnetic anisotropy in high magnetic fields: ${M}^{[100]}>{M}^{[110]}>{M}^{[111]}$. This ratio of magnetization is in good agreement with that of the magnetically anisotropic ${mathrm{ensuremath{Gamma}}}_{67}$ quartet. The observation indicates that the crystalline electric field ground state is a ${mathrm{ensuremath{Gamma}}}_{67}$ quartet and that the $ctext{ensuremath{-}}f$ hybridization effect is nearly isotropic. In addition, comparison of the present experimental results with numerical calculations of a two-sublattice model using the mean-field approximation suggests that the C phase is a ${mathrm{ensuremath{Gamma}}}_{5}$-type antiferroquadrupolar ordered state despite the presence of strong $ctext{ensuremath{-}}f$ hybridization effects. In this case, the increase in ${T}_{mathrm{C}}$ due to the external field is mainly caused by the ${mathrm{ensuremath{Gamma}}}_{2}$-type antiferro-octupolar interaction." @default.
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- W3216524979 date "2021-11-23" @default.
- W3216524979 modified "2023-10-06" @default.
- W3216524979 title "Possible antiferroquadrupolar order in the Kondo semiconductor CeOs4Sb12" @default.
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- W3216524979 doi "https://doi.org/10.1103/physrevb.104.195144" @default.
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