Quantum liquid of vortices in superconductors atT=0

We investigate the existence of a T=0 quantum melting transition in the vortex system of a type-II superconductor. We find that homogeneous high-resistance thin films are good candidates for the observation of this effect. We calculate both the continuous dislocation-mediated melting line Bₘᵈ(T) as well as the first-order melting line BₘG(T) driven by Gaussian fluctuations and present the resulting H-T phase diagram. At low temperatures the melting line BₘG extrapolates to a value below the upper critical field, resulting in a quantum liquid state in the region BₘGBHc2.