Figure 1. ( a ) Temperature and history dependence of azimuthal widths of the ( 1, negative 1 ) diffraction peak at H = 0.3 T. The dashed line is the peak effect T sub p at this magnetic field based on ac magnetic susceptibility measurements. Inset: experimental configuration. ( b ) Widths at H = 0.2 T. The ac susceptibility data are also shown for reference. Definitions of T sub p ( H ) and T sub c 3 ( H ) are shown.

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