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Magnetic multipole analysis of kagome and artificial ice dipolar arrays

Möller, Gunnar, Moessner, Roderich (2009) Magnetic multipole analysis of kagome and artificial ice dipolar arrays. Physical Review B: Condensed Matter and Materials Physics, 80 (14). p. 140409. ISSN 0163-1829. (doi:10.1103/PhysRevB.80.140409) (KAR id:55531)

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We analyse an array of linearly extended monodomain dipoles forming square and kagome lattices. We find that its phase diagram contains two (distinct) finite-entropy kagome ice regimes - one disordered, one algebraic - as well as a low-temperature ordered phase. In the limit of the islands almost touching, we find a staircase of corresponding entropy plateaux, which is analytically captured by a theory based on magnetic charges. For the case of a modified square ice array, we show that the charges (`monopoles') are excitations experiencing two distinct Coulomb interactions: a magnetic `three-dimensional' one as well as a logarithmic `two dimensional' one of entropic origin.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.80.140409
Uncontrolled keywords: Physics of Quantum Materials
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Gunnar Moeller
Date Deposited: 05 Dec 2017 15:54 UTC
Last Modified: 16 Nov 2021 10:22 UTC
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