In an externally applied magnetic field, ultra-pure crystals of the bilayer compound Sr3Ru2O7 undergo a metamagnetic transition below a critical temperature, T∗, which varies as a function of the angle between the magnetic field H and the Ru-O planes. Moreover, T∗ approaches zero when H is perpendicular to the planes. This putative "metamagnetic quantum critical point", however, is preempted by a nematic fluid phase with order one resistive anisotropy in the {\it ab} plane. In a "realistic" bilayer model with moderate strength local Coulomb interactions, the existence of a sharp divergence of the electronic density of states near a van Hove singularity of the quasi-one-dimensional bands, and the spin-orbit couplings permitted by the presence of multiple orbitals result in a mean-field phase diagram which accounts for many of these experimentally observed phenomena. Although the spin-orbit coupling is not overly strong, it destroys the otherwise near perfect Fermi surface nesting and hence suppresses spin-density-wave (SDW) ordering.
@article{arxiv.0902.1336,
title = {Microscopic theory of the nematic phase in Sr$_3$Ru$_2$O$_7$},
author = {S. Raghu and A. Paramekanti and E. -A. Kim and R. A. Borzi and S. Grigera and A. P. Mackenzie and S. A. Kivelson},
journal= {arXiv preprint arXiv:0902.1336},
year = {2015}
}