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Oscillatory dynamics and quasi-static Campbell regime of the vortex lattice(VL) in twinned YBa2Cu3O7 single crystals has been explored at low fields nearthe peak effect (PE) region by linear and non-linear ac susceptibilitymeasurements. We show evidence that the PE is a dynamic anomaly observed in thenon-linear response, and is absent in the Labusch constant derived from thelinear Campbell regime. Static properties play a major role however, and weidentify two H(T) lines defining the onset and the end of the effect. At H1(T)a sudden increase in the curvature of the pinning potential wells with fieldcoincides with the PE onset. At a higher field, H2(T), a sudden increase inlinear ac losses, where dissipative forces overcome pinning forces, marks theend of Campbell regime and, simultaneously, the end of the PE anomaly. Vortexdynamics was probed in frequency dependent measurements, and we find that inthe PE region, vortex dynamics goes beyond the description of a power law witha finite creep exponent for the constitutive relation.Comment: 8 pages, 5 figure

Peak effect in YBCO crystals: statics and dynamics of the vortex lattice