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We report a comprehensive study of dc susceptibility, specific heat, neutrondiffraction, and inelastic neutron scattering measurements on polycrystallineBa3(Cr1-xVx)2O8 samples, where x=0, 0.06, 0.15, and 0.53. A Jahn-Tellerstructure transition occurs for x=0, 0.06, and 0.15 samples and the transitiontemperature is reduced upon vanadium substitution from 70(2) K at x=0 to 60(2)K at x=0.06 and 0.15. The structure becomes less distorted as x increases andsuch transition disappears at x=0.53. The observed magnetic excitation spectrumindicates that the singlet ground state remains unaltered and spin gap energy\Delta=1.3(1) meV is identical within the instrument resolution for all x. Inaddition, the dispersion bandwidth W decreases with increase of x. At x=0.53, Wis reduced to 1.4(1) meV from 2.0(1) meV at x=0.

Structural and magnetic properties in the quantum S=1/2 dimer systems Ba3(Cr1-xVx)2O8 with site disorder