"Visible" 5d orbital states in a pleochroic oxychloride

12 Apr 2019 · Hirai Daigorou, Yajima Takeshi, Nishio-Hamane Daisuke, Kim Changsu, Akiyama Hidefumi, Kawamura Mitsuaki, Misawa Takahiro, Abe Nobuyuki, Arima Taka-hisa, Hiroi Zenji ·

Transition metal compounds sometimes exhibit beautiful colors. We report here on a new oxychloride Ca3ReO5Cl2 which shows unusually distinct pleochroism; that is, the material exhibits different colors depending on viewing directions. This ple-ochroism is a consequence of the fact that a complex crystal field splitting of the 5d orbitals of the Re6+ ion in a square-pyramidal coordination of low-symmetry occurs accidentally in the energy range of the visible light spectrum. Since the rele-vant d-d transitions possess characteristic polarization dependences according to the optical selection rule, the orbital states are "visible" in Ca3ReO5Cl2.

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"Visible" 5d orbital states in a pleochroic oxychloride

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