Physics – Condensed Matter – Superconductivity
Scientific paper
2002-09-27
Physics
Condensed Matter
Superconductivity
Submitted to PRL, 3 figures
Scientific paper
An atomic beam probe is used to study the structure and dynamics of quantized supercurrent vortex lines in YBa_{2}Cu_{3}O_{7-?} at temperatures up to within 0.7 K below T_{C}. 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 T_{C} and is quenched into an immobile hexatic glass at low temperatures.
Hauglin Harald
Lafyatis Gregory P.
Woodard Nathan G.
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