Double-exchange model for noninteracting electron spins coupled to a lattice of classical spins: Phase diagram at zero temperature

David Pekker, Swagatam Mukhopadhyay, Nandini Trivedi, and Paul M. Goldbart
Phys. Rev. B 72, 075118 – Published 11 August 2005

Abstract

The analytical zero-temperature phase diagram of the double exchange model for classical background spins as a function of the carrier density and Hund’s coupling in the entire range of these parameters is presented. By constructing a continuum field theory we explore the possibility of a continuous phase transition from ferromagnetic state to a gently varying textured state. We find such a transition in and below two dimensions and show that the emerging stable state is a spin-spiral which survives the tendency towards phase separation into commonly considered phases, and is also energetically favored to the canted state, for low carrier density.

    • Received 25 February 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.075118

    ©2005 American Physical Society

    Authors & Affiliations

    David Pekker1, Swagatam Mukhopadhyay1, Nandini Trivedi2, and Paul M. Goldbart1

    • 1Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801-3080, USA
    • 2Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA

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    Issue

    Vol. 72, Iss. 7 — 15 August 2005

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