Dynamic quantum melting and novel insulating phase in superconducting vortex solid

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We observe intrinsic melting of fast driven vortex lattice(i. e., dynamic melting) in a superconductor in the limit of zero pinning. With decreasing temperature T, the T dependence of a dynamic melting field B c, dyn(T) becomes very weak and B c, dyn(T) is significantly suppressed compared to a static melting field. This is the first observation of a dynamic quantum melting transition. Although novel insulating phases have not yet been found, related to this issue, it has been revealed that the lattice orientation of the flowing vortex lattice rotates as the velocity exceeds a certain critical value. From this result, it has been first demonstrated that a microscopic mechanism of a quasi-particle life time dominates a macroscopic behavior of vortex dynamics.