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Equilibrium field theory of magnetic monopoles in degenerate square spin ice: Correlations, entropic interactions, and charge screening regimes

Cristiano Nisoli

  • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Phys. Rev. B 102, 220401(R) – Published 1 December, 2020

DOI: https://doi.org/10.1103/PhysRevB.102.220401

Abstract

We describe degenerate square spin as an ensemble of magnetic monopoles coupled via an emergent entropic field that subsumes the effect of the underlying spin vacuum. We compute their effective free energy, entropic interaction, correlations, screening, and structure factor, and find that they coincide with the experimental ones. Unlike in pyrochlore ices, a dimensional mismatch between real and entropic interactions leads to weak singularities at the pinch points and algebraic correlations at long distances. This algebraic screening can be, however, camouflaged by a pseudoscreening regime.

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Outline

Information

Phys. Rev. B 102, 220401(R)– Published 1 December, 2020
  • Received 13 August 2020
  • Revised 23 October 2020
  • Accepted 18 November 2020
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