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Evidence for Gamma₈ Ground-State Symmetry of Cubic YbB12 Probed by Linear Dichroism in Core-Level Photoemission

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arxiv 1504.06248 v3 pith:Y4WG4BUZ submitted 2015-04-23 cond-mat.str-el

Evidence for Gamma₈ Ground-State Symmetry of Cubic YbB12 Probed by Linear Dichroism in Core-Level Photoemission

Yuina Kanai , Takeo Mori , Sho Naimen , Kohei Yamagami , Hidenori Fujiwara , Atsushi Higashiya , Toshiharu Kadono , Shin Imada
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Takayuki Kiss Arata Tanaka Kenji Tamasaku Makina Yabashi Tetsuya Ishikawa Fumitoshi Iga Akira Sekiyama
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classification cond-mat.str-el
keywords dichroismlinearsymmetrycubicgammaybb12core-levelground-state
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We have successfully observed linear dichroism in angle-resolved Yb3+ 3d5/2 core-level photoemission spectra for YbB12 in cubic symmetry. Its anisotropic 4f charge distribution due to the crystal-field splitting is responsible for the linear dichroism, which has been verified by spectral simulations using ionic calculations with the full multiplet theory for a single-site Yb3+ ion in cubic symmetry. The observed linear dichroism as well as the polarization-dependent spectra in two different photoelectron directions for YbB12 are quantitatively reproduced by theoretical analysis for the Gamma_8 ground state, indicating the Gamma_8 ground-state symmetry for the Yb3+ ions mixed with the Yb2+ state.

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