Abstract

We have studied the time dependence of the polarisation state of a neutron beam transmitted through single crystal Bi2Sr2CaCu2O8 + x (Tc = 91 K), after removal of an applied magnetic field. We have used two dimensional polarisation analysis to separate the ordered and disordered components of the pinned flux. Using a magnetising field of 140 mT along the c-axis, we observe a critical temperature at T ∼ 32 K, above which the vortex structure appears to melt.

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