We consider the superconducting vortex solid-to-liquid transition in heavy ion-irradiated untwinned YBa2Cu3O7-d 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. At previously known second-order phase transitions, scaling of physical quantities has either been isotropic or anisotropic in one direction. Thus, our findings yield evidence for a new type of critical behavior with fully anisotropic critical exponents.
@article{arxiv.cond-mat/0703218,
title = {Fully anisotropic superconducting transition in ion-irradiated YBa2Cu3O7-d with a tilted magnetic field},
author = {B. Espinosa-Arronte and M. Andersson and C. J. van der Beek and M. Nikolaou and J. Lidmar and M. Wallin},
journal= {arXiv preprint arXiv:cond-mat/0703218},
year = {2007}
}
Comments
5 pages, 4 figures, to appear as a Rapid Communication in Phys.Rev.B