Abstract
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.
Original language | English |
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Article number | 184423 |
Number of pages | 8 |
Journal | Physical Review. B, Condensed matter and materials physics |
Volume | 90 |
Issue number | 18 |
DOIs | |
Publication status | Published - 21 Nov 2014 |
Keywords
- Magnetic monopoles
- Coulomb phase
- Model
- Systems