Observation of hexatic liquid vortex matter in YBa2Cu3O7
Harald Hauglin, Nathan G. Woodard, Gregory P. Lafyatis
Abstract
An atomic beam probe is used to study the structure and dynamics of quantized supercurrent vortex lines in YBa2Cu3O7-? at temperatures up to within 0.7 K below TC. Here we report the direct observation of a vortex configuration with sample wide bond-orientational order but only short range translational correlation. The data imply the existence of an intermediate `hexatic' vortex line liquid phase. We find that the hexatic liquid is in thermal equilibrium over a narrow temperature range below TC and is quenched into an immobile hexatic glass at low temperatures.
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