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Using a forced torsion pendulum we have investigated the frequency, amplitude and orientation dependence of the vortex response in untwinned single crystals of YBa 2 Cu 3 O 7−δ . A new thermally activated dissipation peak which appears at high amplitude, accompanied by a crossover in the pinning, has been observed in addition to the one associated to the controversial vortex melting. The shape and mass anisotropy effects have been investigated.
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D’Anna et al. (1992) studied this question.
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