Microscopic theory of the nematic phase in Sr3 Ru2 O7

S. Raghu, A. Paramekanti, E. A. Kim, R. A. Borzi, S. A. Grigera, A. P. MacKenzie, S. A. Kivelson

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

In an externally applied magnetic field, ultrapure crystals of the bilayer compound Sr3 Ru2 O7 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 pre-empted by a nematic fluid phase with order one resistive anisotropy in the 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 presence of spin-orbit coupling results 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 ordering.

Original languageEnglish
Article number214402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number21
DOIs
StatePublished - 4 Jun 2009

Fingerprint

Dive into the research topics of 'Microscopic theory of the nematic phase in Sr3 Ru2 O7'. Together they form a unique fingerprint.

Cite this