[22p-D214-1~15] 9.5 New functional materials and new phenomena

△ [22p-D214-9] Pressure-induced intersite charge transfer in oxyhydride EuVO₂H

〇(D)Morito Namba¹, Hiroshi Takatsu¹, Mikita Riho¹, Li Haobo¹, Murayama Kantaro¹, Terada Ryo¹, Kageyama Hiroshi¹ (1.Kyoto Univ.)

Keywords:charge transfer, perovskite oxyhydride, Mott insulator

Intersite charge transfer has attracted much attention because of the unique phenomena associated with it. We have succeeded in synthesizing EuVO₂H by the low-temperature reduction of EuVO₃, in which the Sr site of SrVO₂H is fully replaced by Eu. XANES measurements under high pressure show that the charge transfer between Eu²⁺ and V³⁺ occurs, and associated metallization takes place at ~15 GPa. the Eu 4f orbitals mediate the metal-insulator transition that preserves the quasi-two-dimensional band state of V 3d. In the presentation, we will make a discussion including the structural change.