Evidence of pressure induced compressibility enhancement in pure and Cr-doped vanadium dioxide

Details Evidence of pressure induced compressibility enhancement in pure and Cr-doped vanadium dioxide Evidence of pressure induced compressibility enhancement in pure and Cr-doped vanadium dioxide

2011-10-09

arxiv.org/abs/1110.1844v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We present structural studies of V$_{1-x}$Cr$_x$O$_2$ ($x$ = 0.0, 0.007 and 0.025) 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 to 13 GPa. Above 13 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 $b_{M1}$-$c_{M1}$ plane. Remarkably, a 10% reduction in the bulk modulus is observed at higher pressures, which indicates that the V$_{1-x}$Cr$_x$O$_2$ becomes softer under pressure. This unexpected behavior can be reconciled invoking the pressure induced charge-delocalization.

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