Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β–Li2IrO3

Ducatman, Samuel; Rousochatzakis, Ioannis; Perkins, Natalia B.

doi:10.1103/PhysRevB.97.125125

Title: Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet $β – {Li}_{2} {IrO}_{3}$

Journal Article · Fri Mar 16 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.125125· OSTI ID:1637941

Ducatman, Samuel ^[1]; Rousochatzakis, Ioannis ^[1]; Perkins, Natalia B. ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)

We present a theoretical study of the static and dynamical properties of the three-dimensional, hyperhoneycomb Kitaev magnet β–Li₂IrO₃. We argue that the observed incommensurate order can be understood in terms of a long-wavelength twisting of a nearby commensurate period-3 state, with the same key qualitatively features. The period-3 state shows very different structure when either the Kitaev interaction K or the off-diagonal exchange anisotropy Γ is dominant. A comparison of the associated static spin structure factors with reported scattering experiments in zero and finite fields gives strong evidence that β–Li₂IrO₃ lies in the regime of dominant Kitaev coupling, and that the Heisenberg exchange J is much weaker than both K and Γ. Furthermore, our predictions for the magnon excitation spectra, the dynamical spin structure factors, and their polarization dependence provide additional distinctive fingerprints that can be checked experimentally.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0018056; DMR-1511768; PHY-1125915

OSTI ID:: 1637941

Alternate ID(s):: OSTI ID: 1426520

Journal Information:: Physical Review B, Vol. 97, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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