Symmetry breaking on the three-dimensional hyperkagome lattice of Na4Ir3O8

We study the antiferromagnetic spin-1/2 Heisenberg model on the highly frustrated, three-dimensional, hyperkagome lattice of Na(4)Ir(3)O(8) using a series expansion method. We propose a valence bond crystal with a 72 site unit cell as a ground state that supports many, very low lying, singlet excita...

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Bibliographic Details
Published inPhysical review letters Vol. 105; no. 23; p. 237202
Main Authors Bergholtz, E J, Läuchli, A M, Moessner, R
Format Journal Article
LanguageEnglish
Published United States 03.12.2010
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Summary:We study the antiferromagnetic spin-1/2 Heisenberg model on the highly frustrated, three-dimensional, hyperkagome lattice of Na(4)Ir(3)O(8) using a series expansion method. We propose a valence bond crystal with a 72 site unit cell as a ground state that supports many, very low lying, singlet excitations. Low energy spinons and triplons are confined to emergent lower-dimensional motifs. Here, and for analogous kagome and pyrochlore states, we suggest finite temperature signatures, including an Ising transition, in the magnetic specific heat due to a multistep breaking of discrete symmetries.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.105.237202