Anisotropic Melting of Frustrated Ising Antiferromagnets

Matthew W. Butcher, Makariy A. Tanatar, and Andriy H. Nevidomskyy
Phys. Rev. Lett. 130, 166701 – Published 19 April 2023
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Abstract

Magnetic frustrations and dimensionality play an important role in determining the nature of the magnetic long-range order and how it melts at temperatures above the ordering transition TN. In this Letter, we use large-scale Monte Carlo simulations to study these phenomena in a class of frustrated Ising spin models in two spatial dimensions. We find that the melting of the magnetic long-range order into an isotropic gaslike paramagnet proceeds via an intermediate stage where the classical spins remain anisotropically correlated. This correlated paramagnet exists in a temperature range TN<T<T*, whose width increases as magnetic frustrations grow. This intermediate phase is typically characterized by short-range correlations; however, the two-dimensional nature of the model allows for an additional exotic feature—formation of an incommensurate liquidlike phase with algebraically decaying spin correlations. The two-stage melting of magnetic order is generic and pertinent to many frustrated quasi-2D magnets with large (essentially classical) spins.

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  • Received 31 December 2021
  • Revised 23 May 2022
  • Accepted 2 March 2023

DOI:https://doi.org/10.1103/PhysRevLett.130.166701

© 2023 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied PhysicsStatistical Physics & Thermodynamics

Authors & Affiliations

Matthew W. Butcher1, Makariy A. Tanatar2,3, and Andriy H. Nevidomskyy1,*

  • 1Department of Physics and Astronomy, Rice University, Houston Texas 77005, USA
  • 2Ames National Laboratory, Ames, Iowa 50011, USA
  • 3Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *nevidomskyy@rice.edu

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Issue

Vol. 130, Iss. 16 — 21 April 2023

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