Journal
PHYSICAL REVIEW B
Volume 84, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.144435
Keywords
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Funding
- EPSRC [EP/G049394/1]
- NSF [DMR-1006608]
- EPSRC [EP/G049394/1, EP/G049394/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G049394/2, EP/G049394/1] Funding Source: researchfish
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At low temperatures, spin ice is populated by a finite density of magnetic monopoles-pointlike topological defects with a mutualmagnetic Coulomb interaction. We discuss the properties of the resulting magnetic Coulomb liquid in the framework of Debye-Huckel theory, for which we provide a detailed context-specific account. We discuss both thermodynamical and dynamical signatures and compare Debye-Huckel theory to experiment as well as numerics, including data for specific heat and AC susceptibility. We also evaluate the entropic Coulomb interaction that is present in addition to the magnetic one and show that it is quantitatively unimportant in the current compounds. Finally, we address the role of bound monopole anti-monopole pairs and derive an expression for the monopole mobility.
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