Magnetic multipole analysis of kagome and artificial ice dipolar arrays

Details Magnetic multipole analysis of kagome and artificial ice dipolar arrays Magnetic multipole analysis of kagome and artificial ice dipolar arrays

2009-06-22

arxiv.org/abs/0906.3937v2

Phys. Rev. B 80, 140409(R) (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2 figures; v2: minor changes as in final published version

Scientific paper

10.1103/PhysRevB.80.140409

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.

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