Successive single- and double-q ${\Gamma }_3$ quadrupole orders on the diamond structure

Abstract

We investigate field-dependent quadrupolar ordering at the L points of the diamond-structure Brillouin zone using classical Monte Carlo simulations of an effective ${\Gamma }_3$ quadrupole model. We demonstrate that competition between the magnetic field and quadrupole anisotropy leads to a rich phase diagram for magnetic fields applied parallel to [001], which includes switching between a single-q state and a double-q state. We also examine the effects of a symmetry-allowed biquadratic intersite interaction, corresponding to a hexadecapole interaction, on the stability of the double-q state under a magnetic field.

arXiv comment9 pages, 9 figures (the title, fig.7, fig.A-2 have been slightly changed from the previous version)