We observe a disappearance of the 1/3 magnetization plateau and a striking change of the magnetic configuration under a moderate doping of the model triangular antiferromagnet RbFe(MoO4)2. The reason is an effective lifting of degeneracy of mean-field ground states by a random potential of impurities, which compensates, in the low temperature limit, the fluctuation contribution to free energy. These results provide a direct experimental confirmation of the fluctuation origin of the ground state in a real frustrated system. The change of the ground state to a least collinear configuration reveals an effective positive biquadratic exchange provided by the structural disorder. On heating, doped samples regain the structure of a pure compound thus allowing for an investigation of the remarkable competition between thermal and structural disorder.
@article{arxiv.1707.07168,
title = {Order by quenched disorder in the model triangular antiferromagnet RbFe(MoO4)2},
author = {A. I. Smirnov and T. A. Soldatov and O. A. Petrenko and A. Takata and T. Kida and M. Hagiwara and A. Ya. Shapiro and M. E. Zhitomirsky},
journal= {arXiv preprint arXiv:1707.07168},
year = {2017}
}
Comments
Letter and Supplemental material, 10 pages, 14 figures, accepted for Phys.Rev.Letters, July 2017: https://journals.aps.org/prl/accepted/9907fY9bP6c12565988d7b717d5069faa7fb6863a