Physical Review Letters· 2014Q1
Generic Spin Model for the Honeycomb Iridates beyond the Kitaev Limit
- 715citations
- Q1SCImago
- 2014year
Short summary
A new generic spin Hamiltonian for honeycomb iridates accounts for both oxygen-mediated and direct orbital overlap, revealing new magnetic phases like 120° and incommensurate spiral order near the Kitaev limit.
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Key points
- Developed a generic spin Hamiltonian for honeycomb iridates considering both oxygen-mediated and direct orbital overlap.
- The model includes Heisenberg, Kitaev terms, and bond-dependent off-diagonal exchange.
- Analysis revealed new magnetic phases: 120° and incommensurate spiral order.
- Extended regions of zigzag and stripy order were identified near the Kitaev limit.
AI-generated from the title and abstract; the full text is not read.
Abstract
Recently, realizations of Kitaev physics have been sought in the A2IrO3 family of honeycomb iridates, originating from oxygen-mediated exchange through edge-shared octahedra. However, for the jeff=1/2 Mott insulator in these materials, exchange from direct d-orbital overlap is relevant, and it was proposed that a Heisenberg term should be added to the Kitaev model. Here, we provide the generic nearest-neighbor spin Hamiltonian when both oxygen-mediated and direct overlap are present, containing a bond-dependent off-diagonal exchange in addition to Heisenberg and Kitaev terms. We analyze this complete model using a combination of classical techniques and exact diagonalization. Near the Kitaev limit, we find new magnetic phases, 120° and incommensurate spiral order, as well as extended regions of zigzag and stripy order. Possible applications to Na2IrO3 and Li2IrO3 are discussed.
The authors' abstract, as published at the source. Physical Review Letters, 2014 · DOI ↗
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Field: Condensed Matter Physics
Condensed Matter PhysicsPhysics and Astronomy