  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.
