Equilibrium Field Theory of Magnetic Monopoles in Degenerate Square Spin Ice: Correlations, Entropic Interactions, and Charge Screening Regimes
arXiv:2009.11331 · doi: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 factors that 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 distance. This algebraic screening can be, however, camouflaged by a pseudo-screening regime.
6 Pages, 4 Figures
References in corpus (13)
- Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
- Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7
- Enhancement of Carrier Mobility in Semiconductor Nanostructures by Dielectric Engineering
- Direct observation of the ice rule in artificial kagome spin ice
- Extensive degeneracy, Coulomb phase and magnetic monopoles in an artificial realization of the square ice model
- Artificial square ice and related dipolar nanoarrays
- Magnetic monopole and string excitations in a two-dimensional spin ice
- Ice Rule and Emergent Frustration in Particle Ice and Beyond
- Continuous magnetic phase transition in artificial square ice
- Nambu monopoles interacting with lattice defects in two-dimensional artificial square spin ice
- Static properties of 2D spin-ice as a sixteen-vertex model
- The Concept of Spin Ice Graphs and a Field Theory for their Topological Monopoles and Charges
- Artificial vertex systems by design