Termination of the Berezinskii-Kosterlitz-Thouless phase with a new critical universality in spin-crossover systems

Masamichi Nishino and Seiji Miyashita
Phys. Rev. B 92, 184404 – Published 3 November 2015

Abstract

Two-dimensional systems with U(1) symmetry exhibit a peculiar phase, i.e., the Berezinskii-Kosterlitz-Thouless (BKT) phase. In particular situations, the BKT phase exists as an intermediate-temperature phase. There have been scenarios for the phase transitions at the two end points of the intermediate BKT phase; i.e., the phase transition at the low-temperature end point is a BKT transition and that at the high-temperature end point is either a BKT transition or a first-order transition. The present study gives a novel scenario, i.e., a second-order transition with a new critical universality and a BKT transition. We found that this new phase transition is realized in spin-crossover systems on a triangular lattice with an antiferromagnetic short-range interaction. At the low-temperature transition the elastic interaction plays as a ferromagnetic infinite-range interaction and encourages the breaking of Z2 symmetry between high-spin-rich and low-spin-rich states.

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  • Received 15 May 2015

DOI:https://doi.org/10.1103/PhysRevB.92.184404

©2015 American Physical Society

Authors & Affiliations

Masamichi Nishino1,* and Seiji Miyashita2,3

  • 1Computational Materials Science Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
  • 2Department of Physics, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
  • 3CREST, JST, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

  • *Corresponding author: nishino.masamichi@nims.go.jp

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Issue

Vol. 92, Iss. 18 — 1 November 2015

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