Abstract
We report a comprehensive study of the DC susceptibility, specific heat, neutron diffraction,
and inelastic neutron scattering measurements on the polycrystalline Ba3(Cr1-xVx)2O8 samples,
where x=0, 0.06, 0.15, and 0.53. A Jahn-Teller structure transition occurs for x=0, 0.06, and 0.15
samples and the transition temperature 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 and such
transition disappears at x=0.53. The observed magnetic excitation spectrum indicates that the
singlet ground state remains unaltered and spin gap energy Δ=1.3(1) meV is identical within the
instrument resolution for all x. In addition, the dispersion bandwidth W decreases with increase of
x. At x=0.53, W is reduced to 1.4(1) meV from 2.0(1) meV at x=0.
