[10a-N403-1~12] 9.1 誘電材料・誘電体

[10a-N403-6] 可視光応答Fe-doped BaTiO₃単結晶の強誘電体光起電力テンソル

〇野口 祐二¹ (1.熊本大学)

キーワード：強誘電体、光起電力、格子欠陥

This paper reports the hv dependence of the bulk photovoltaic tensor elements beta_33 and beta_31 of Fe-doped BaTiO₃ single crystals. The reduced sample in the Fe²⁺- and Fe³⁺-coexisting state exhibits the elements over one order of magnitude higher than those of the oxidized one in the Fe³⁺ state. The reduced sample has a relation of |beta_31| > |beta_33| at hv above 2.8 eV, which originates from the dominant charge transfer from oxygen atoms to Fe³⁺ whose transfer vector is normal to P_s.