3D Kasteleyn transition in spin ice: Numerical Studies

MARIA LAURA BAEZ; RODOLFO ALBERTO BORZI

Berlin

Otro; 34th Berlin School on Neutron Scattering; 2014

Helmholtz-Zentrum Berlin

We study spin ice systems with an applied magnetic field in the [100] direction using a single spin flip algorithm with and additional constraint: the number of magnetic monopoles in the system must be constant throughout the simulation. This constraint allow us to visit only the lowest energy manifold. As a first approach we study the nearest neighbour model. The interplay between spin correlations and the applied magnetic field produce a singular phase transition with no fluctuations al low temperature. We identify this transition as a Kasteleyn transition and reproduce the previous results obtained with a worm algorithm, thus testing the constraint monopoles method. Finally, we study the effect of dipolar interactions on the Kasteleyn transition. We find a high temperature transition that we identify as a Kasteleyn phase transition. Al low temperature and fields less than 0.06T we find two extra phases. One of them was identified with the order phase found by Melko, den Hertog, and Gingras (MHG state). The other phase was not expected, we identified it with a phase that share characteristics with the saturated state of the Kasteleyn transition and with the MHG state.