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We have investigated the depinning process of magnetic flux vortices in twinned crystals of YBa2Cu3O7-δ in intermediate applied magnetic fields parallel to the crystallographic c axis through precise resistivity measurements before and after fast-neutron irradiation. Of particular interest for each field is the power-law dependence of the electric field on current density, E∝Jn, at a well defined temperature which separates a nonlinear region below from a more linear, dissipative region above. We find that n shows a striking dependence on the estimated value of the Larkin-Ovchinnikov length. The relation is not only manifest before and after irradiation but also for a variety of samples, including films, crystals, and at least two copper oxides other than YBa2Cu3O7-δ.


Article published in Physical Review B, 55, pp R8713-R8716 (1997).

© 1997 The American Physical Society


DOI: 10.1103/PhysRevB.55.R8713

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