Fully anisotropic superconducting transition in ion irradiated YBa2Cu3O7−delta with a tilted magnetic field
Résumé
We consider the superconducting vortex solid-to-liquid transition in heavy ion-irradiated untwinned YBa2Cu3O7−delta single crystals in the case where the magnetic field direction does not coincide with that of the irradiation-induced linear columnar defects. For a certain range of angles, the resistivities measured in three orthogonal spatial directions vanish at the transition as three clearly different powers of reduced temperature. This is in contrast to the usual isotropic scaling of physical quantities close to a continuous phase transition, and to the Bose glass transition occurring for field parallel to the columns, where the scaling is anisotropic in one direction. Thus, our findings yield evidence for a new type of critical behavior with fully anisotropic critical exponents. 1
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