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Emergent Ising degrees of freedom above a double-stripe magnetic ground state

TitleEmergent Ising degrees of freedom above a double-stripe magnetic ground state
Publication TypeJournal Article
Year of Publication2017
AuthorsZhang, GH, Flint, R
JournalPhysical Review B
Date Published12
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000418754000002
Keywordsdisorder, nematicity, order, physics, superconductors

J(1). Intriguingly, besides breaking spin-rotational symmetry, the ground-state manifold has three additional Ising degrees of freedom associated with bond ordering. Via their coupling to the lattice, they give rise to an orthorhombic distortion and to two nonuniform lattice distortions with wave vector (pi,pi). Because the ground state is fourfold degenerate, modulo rotations in spin space, only two of these Ising bond order parameters are independent. Here, we introduce an effective field theory to treat all Ising order parameters, as well as magnetic order, and solve it within a large-N limit. All three transitions, corresponding to the condensations of two Ising bond order parameters and one magnetic order parameter are simultaneous and first order in three dimensions, but lower dimensionality, or equivalently weaker interlayer coupling, and weaker magnetoelastic coupling can split the three transitions, and in some cases allows for two separate Ising phase transitions above the magnetic one.

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