Order by disorder and spiral spin liquid in frustrated diamond lattice antiferromagnets

Details Order by disorder and spiral spin liquid in frustrated diamond lattice antiferromagnets Order by disorder and spiral spin liquid in frustrated diamond lattice antiferromagnets

2006-11-30

arxiv.org/abs/cond-mat/0612001v1

Nature Physics 3, 487 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1038/nphys622

Frustration refers to competition between different interactions that cannot be simultaneously satisfied, a familiar feature in many magnetic solids. Strong frustration results in highly degenerate ground states, and a large suppression of ordering by fluctuations. Key challenges in frustrated magnetism are characterizing the fluctuating spin-liquid regime and determining the mechanism of eventual order at lower temperature. Here, we study a model of a diamond lattice antiferromagnet appropriate for numerous spinel materials. With sufficiently strong frustration a massive ground state degeneracy develops amongst spirals whose propagation wavevectors reside on a continuous two-dimensional ``spiral surface'' in momentum space. We argue that an important ordering mechanism is entropic splitting of the degenerate ground states, an elusive phenomena called order-by-disorder. A broad ``spiral spin-liquid'' regime emerges at higher temperatures, where the underlying spiral surface can be directly revealed via spin correlations. We discuss the agreement between these predictions and the well characterized spinel MnSc2S4.

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