Anisotropic compression in the high-pressure regime of pure and chromium-doped vanadium dioxide

Article

关键词: INSULATOR-TRANSITION;    MOTT-HUBBARD;    BAND THEORY;    VO2;    PEIERLS;    VIEW;   

DOI  :  10.1103/PhysRevB.85.184108

来源: SCIE

【 摘 要 】

We present structural studies of V1-xCrxO2 (pure, 0.7 %, and 2.5% Cr-doped) compounds at room temperature in a diamond anvil cell for pressures up to 20 GPa using synchrotron x-ray powder diffraction. All the samples studied show a persistence of the monoclinic M-1 symmetry between 4 and 12 GPa. Above 12 GPa, the monoclinic M-1 symmetry changes to isostructural M-x phase (space group P2(1)/c) with a significant anisotropy in lattice compression of the b-c plane of the M-1 phase. This behavior can be reconciled invoking the pressure-induced charge delocalization.

【 授权许可】

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