Abstract
Measurements of single crystal ${\mathrm{MgB}}_{2}$ with torque magnetometry in fields up to 90 kOe reveal a sharp peak in the irreversible torque at about $0.85{H}_{c2}.$ In the region between peak onset and maximum, pronounced history effects occur. Angle and temperature dependence of the characteristic peak fields track those of ${H}_{c2}.$ The features observed suggest that the peak marks a disorder-induced phase transition of vortex matter between a quasiordered Bragg glass and a highly disordered phase.
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