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Double-stage nematic bond ordering above double stripe magnetism: Application to BaTi2Sb2O

TitleDouble-stage nematic bond ordering above double stripe magnetism: Application to BaTi2Sb2O
Publication TypeJournal Article
Year of Publication2017
AuthorsZhang, G, Glasbrenner, JK, Flint, R, Mazin, II, Fernandes, RM
JournalPhysical Review B
Volume95
Pagination174402
Date Published05
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000400659400003
Keywordscharge, dynamics, energy, ferropnictides, na(2)ti(2)pn(2)o, na2ti2sb2o, physics, pn, pnictide-oxides, superconductors, wave
Abstract

strong candidate for a more exotic form of spin-driven nematic order, in which fluctuations occurring in four Neel sublattices promote both nearest-and next-nearestneighbor bond order. We develop a low-energy field theory of this state and show that it can have, as a function of temperature, up to two separate bond-order phase transitions, namely, one that breaks rotation symmetry and one that breaks reflection and translation symmetries of the lattice. The resulting state has an orthorhombic lattice distortion, an intra-unit-cell charge density wave, and no long-range magnetic order, all consistent with reported measurements of the low-temperature phase of BaTi2Sb2O. We then use density functional theory calculations to extract exchange parameters to confirm that the model is applicable to BaTi2Sb2O.

DOI10.1103/PhysRevB.95.174402
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Alternate JournalPhys. Rev. B