Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W56: Quantum Spin Liquids, Theory II
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 304
Sponsoring
Unit:
GMAG
Chair: Martin Mourigal, Georgia Tech
Abstract: W56.00003 : Kitaev exchange in new Ruthenium-based honeycomb and triangular lattice compounds*
3:24 PM–3:36 PM
Presenter:
David Kaib
(Goethe University Frankfurt)
Authors:
David Kaib
(Goethe University Frankfurt)
Aleksandar Razpopov
(Goethe University Frankfurt)
Kira Riedl
(Goethe University Frankfurt)
Francesco Ferrari
(Goethe University Frankfurt)
Ying Li
(Xi'an Jiaotong Univ)
Steffen Backes
(University of Tokyo)
Igor I Mazin
(George Mason University)
Roser Valenti
(Goethe University Frankfurt)
In this ab-initio based study we consider new Ruthenium-based candidate materials: The honeycomb compounds RuBr3, RuI3 [1] and the triangular-lattice compound NaRuO2. Our computed magnetic models contain large Kitaev and bond-dependent Gamma exchange in all cases, but feature different ground states. We compare to recent experimental data, which do not find magnetic order for RuI3 and NaRuO2.
Aside from frustrated bilinear exchange, four-spin ring exchange on the triangular lattice is an established mechanism to suppress magnetic order. In the Kitaev-candidate Ruthenates, spin-orbit coupling is expected to turn also such higher-order exchanges strongly anisotropic. We therefore systematically study the effects of such new SU(2)-breaking ring exchanges and compute them explicitly for NaRuO2.
[1] Kaib et al., npj Quantum Materials 7, 75 (2022).
*We gratefully acknowledge funding by the DFG (German research foundation): Project No. 411289067 (VA117/15-1) and TRR 288 – 422213477.
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