Monopole ordered phases in dipolar and nearest-neighbors Ising pyrochlore : from spin ice to the all-in-all-out antiferromagnet
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We study Ising pyrochlores by means of Monte Carlo simulations. We cover a set of exchange constants ranging from the frustrated ferromagnetic case (spin-ice) to the fully-ordered "all-in-all-out" antiferromagnet in the dipolar model, reinterpreting the results-as in an ionic system-in terms of a temperature vs magnetic charge density phase diagram. In spite of its spin nature and the presence of both double and single nonconserved magnetic charges, the dipolar model gives place to a phase diagram which is quite comparable with those previously obtained for on-lattice systems of electric charges, and on spin ice models with a conserved number of single magnetic charges. The contrast between these systems, to which we add results from the nearest-neighbors model, put forward other features of our phase diagram-notably, a monopole fluid with charge order at high monopole densities that persists up to arbitrarily high temperatures-that can only be explained taking into account construction constraints forced by the underlying spin degrees of freedom.
Guruciaga , P C , Grigera , S A & Borzi , R A 2014 , ' Monopole ordered phases in dipolar and nearest-neighbors Ising pyrochlore : from spin ice to the all-in-all-out antiferromagnet ' , Physical Review. B, Condensed matter and materials physics , vol. 90 , no. 18 , 184423 . https://doi.org/10.1103/PhysRevB.90.184423
Physical Review. B, Condensed matter and materials physics
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