Magnetic-charge ordering and phase transitions in monopole-conserved square spin ice.

Abstract:

:Magnetic-charge ordering and corresponding magnetic/monopole phase transitions in spin ices are the emergent topics of condensed matter physics. In this work, we investigate a series of magnetic-charge (monopole) phase transitions in artificial square spin ice model using the conserved monopole density algorithm. It is revealed that the dynamics of low monopole density lattices is controlled by the effective Coulomb interaction and the Dirac string tension, leading to the monopole dimerization which is quite different from the dynamics of three-dimensional pyrochlore spin ice. The condensation of the monopole dimers into monopole crystals with staggered magnetic-charge order can be predicted clearly. For the high monopole density cases, the lattice undergoes two consecutive phase transitions from high-temperature paramagnetic/charge-disordered phase into staggered charge-ordered phase before eventually toward the long-range magnetically-ordered phase as the ground state which is of staggered charge order too. A phase diagram over the whole temperature-monopole density space, which exhibits a series of emergent spin and monopole ordered states, is presented.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Xie YL,Du ZZ,Yan ZB,Liu JM

doi

10.1038/srep15875

subject

Has Abstract

pub_date

2015-10-29 00:00:00

pages

15875

issn

2045-2322

pii

srep15875

journal_volume

5

pub_type

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