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27 April 2024

» arxiv » 1110.1844

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Evidence of pressure induced compressibility enhancement in pure and Cr-doped vanadium dioxide
Matteo Mitrano ; Beatrice Maroni ; Carlo Marini ; Michael Hanfland ; Boby Joseph ; Paolo Postorino ; Lorenzo Malavasi ;
Date:	9 Oct 2011
Abstract:	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.
Source:	arXiv, 1110.1844
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