Magnetic field induced evolution of intertwined orders in the Kitaev magnet β–Li2IrO3

Rousochatzakis, Ioannis; Perkins, Natalia B.

doi:10.1103/PhysRevB.97.174423

Title: Magnetic field induced evolution of intertwined orders in the Kitaev magnet $β – {Li}_{2} {IrO}_{3}$

Journal Article · Thu May 24 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.174423· OSTI ID:1637707

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

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

Recent scattering experiments in the 3D Kitaev magnet β–Li₂IrO₃ have shown that a relatively weak magnetic field along the crystallographic b axis drives the system from its incommensurate counter-rotating order to a correlated magnet, with a significant uniform ‘zigzag’ component superimposing the magnetization along the field. Here it is shown that the zigzag order is not emerging from its linear coupling to the field (via a staggered, off-diagonal element of the g tensor) but from its intertwining with the incommensurate order and the longitudinal magnetization. The emerging picture explains all qualitative experimental findings at zero and finite fields, including the rapid decline of the incommensurate order with field and the so-called intensity sum rule. The latter are shown to be independent signatures of the smallness of the Heisenberg exchange J, compared to the Kitaev coupling K and the off-diagonal anisotropy Γ. Remarkably, in the regime of interest, the field H* at which the incommensurate component vanishes, depends essentially only on J, which allows us to extract an estimate of J≃4 K from reported measurements of H*. Lastly, we also comment on recent experiments in pressurized β–Li₂IrO₃ and conclude that J decreases with pressure.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018056

OSTI ID:: 1637707

Alternate ID(s):: OSTI ID: 1438955

Journal Information:: Physical Review B, Vol. 97, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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