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Using high sensitivity magneto-optical imaging we find evidence for a jump inlocal vortex density associated with a vortex liquid to solid phase transitionjust above the lower critical field in a single crystal of Bi2Sr2CaCu2O8. Wefind the regions of the sample where the jump in vortex density occurs areassociated with low screening currents. In the field - temperature vortex phasediagram we identify phase boundaries demarcating a dilute vortex liquid phaseand the vortex solid phase. The phase diagram also identifies a coexistenceregime of the dilute vortex liquid and solid phases and shows the effect ofpinning on the vortex liquid to solid phase transition line. We find the phaseboundary lines can be fitted to the theoretically predicted expression for thelow-field portion of the phase boundary delineating a dilute vortex solid froma vortex liquid phase. We show that the same theoretical fit can be used todescribe the pinning dependence of the low-field phase boundary lines provideda dependence of the Lindemann number on pinning strength is considered.

Visualizing a dilute vortex liquid to solid phase transition in a Bi2Sr2CaCu2O8 single crystal