Microscopic theory of the nematic phase in Sr3Ru2O7

S. Raghu, A. Paramekanti, E. A. Kim, Rodolfo Alberto Borzi, Santiago Andres Grigera, Andrew Mackenzie, S. A. Kivelson

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

In an externally applied magnetic field, ultrapure 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 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
Number of pages10
JournalPhysical Review. B, Condensed matter and materials physics
Volume79
Issue number21
DOIs
Publication statusPublished - Jun 2009

Keywords

  • electronic density of states
  • Fermi surface
  • magnetic field effects
  • metamagnetism
  • phase diagrams
  • spin density waves
  • spin-orbit interactions
  • strontium compounds
  • HIGH-TEMPERATURE SUPERCONDUCTORS
  • POMERANCHUK INSTABILITY
  • QUANTUM CRITICALITY
  • RUTHENATE SR3RU2O7
  • METAMAGNETISM
  • DISORDER
  • SR2RUO4
  • STRIPES
  • MODEL

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