Vortex-line-lattice torque in anisotropic superconductors

Abstract We calculate the magnetic torque τ = M × H that an uniaxial superconductor feels in presence of an external magnetic field of magnitude H , oriented of an angle α with respect to its c -axis. Our simulated annealing numerical method minimize the Gibbs free energy in the London aproximation, and we assume straight vortex lines and a vortex-line lattice with only one vortex per unit cell. Here we report results near the lowest critical field region H c1 .