Phase separation of antiferromagnetic ground states in systems with imperfect nesting

A. L. Rakhmanov, A. V. Rozhkov, A. O. Sboychakov, and Franco Nori
Phys. Rev. B 87, 075128 – Published 19 February 2013

Abstract

We analyze the phase diagram for a system of weakly coupled electrons having an electron- and a hole-band with imperfect nesting. Namely, both bands have spherical Fermi surfaces, but their radii are slightly different, with a mismatch proportional to the doping. Such a model is used to describe the antiferromagnetism of chromium and its alloys, pnictides, AA-stacked graphene bilayers, as well as other systems. Here we show that the uniform ground state of this model is unstable with respect to electronic phase separation in a wide range of model parameters. Physically, this instability occurs due to the competition between commensurate and incommensurate antiferromagnetic states and could be of importance for other models with imperfect nesting.

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  • Received 29 November 2012

DOI:https://doi.org/10.1103/PhysRevB.87.075128

©2013 American Physical Society

Authors & Affiliations

A. L. Rakhmanov1,2,3, A. V. Rozhkov1,2, A. O. Sboychakov1,2, and Franco Nori1,4

  • 1Advanced Science Institute, RIKEN, Wako-shi, Saitama 351-0198, Japan
  • 2Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, 125412 Moscow, Russia
  • 3Moscow Institute for Physics and Technology (State University), 141700 Moscow Region, Russia
  • 4Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Issue

Vol. 87, Iss. 7 — 15 February 2013

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