Abstract
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Magnetic moment measurements performed on a single crystal sample of (Tl,Pb)(Sr,Ba)2Ca2Cu3Oy reveal an increase in magnetic
moment at intermediate fields. Magnetic hysteresis (mH) loops were taken at different constant temperatures using either a MPMS-
5T SQUID magnetometer or a PPMS-9T magnetometer and within the temperature range 0.1 < T/Tc < 0.85. Vortex dynamics at fields
below the peak in hysteresis loops for the sample is shown to be well explained by a quasi-lattice Bragg glass state and elastic collective
vortex creep.