Spin-orbit coupled jeff=1/2 iridium moments on the geometrically frustrated fcc lattice

Cook, A. M.; Matern, S.; Hickey, C.; Aczel, A. A.; Paramekanti, A.

doi:10.1103/PhysRevB.92.020417

Title: Spin-orbit coupled $j_{eff} = 1 / 2$ iridium moments on the geometrically frustrated fcc lattice

Journal Article · Wed Jul 01 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.020417· OSTI ID:1207051

Cook, A. M. ^[1]; Matern, S. ^[2]; Hickey, C. ^[1]; Aczel, A. A. ^[3]; Paramekanti, A. ^[4]

Univ. of Toronto, ON (Canada)
Univ. of Cologne (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)

We were motivated by experiments on the double perovskites La₂ZnIrO₆ and La₂MgIrO₆, such that our study of the magnetism of spin-orbit coupled j_eff = 1/2 iridium moments on the three-dimensional, geometrically frustrated, face-centered cubic lattice became our focus. Moreover, the symmetry-allowed nearest-neighbor interaction includes Heisenberg, Kitaev, and symmetric off-diagonal exchange. A Luttinger-Tisza analysis shows a rich variety of orders, including collinear A-type antiferromagnetism, stripe order with moments along the {111} direction, and incommensurate noncoplanar spirals, and we use Monte Carlo simulations to determine their magnetic ordering temperatures. Finally, we argue that existing thermodynamic data on these iridates underscores the presence of a dominant Kitaev exchange, and also suggest a resolution to the puzzle of why La₂ZnIrO₆, but not La₂MgIrO₆, exhibits "weak" ferromagnetism.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1207051

Alternate ID(s):: OSTI ID: 1204698; OSTI ID: 1261459

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 2; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 38 works

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Title: Spin-orbit coupled $j_{eff} = 1 / 2$ iridium moments on the geometrically frustrated fcc lattice