Strongly frustrated triangular spin lattice emerging from triplet dimer formation in honeycomb Li2IrO3
| Autor: | Satoshi Nishimoto, Ioannis Rousochatzakis, Ulrich K. Rößler, Vamshi M. Katukuri, V. Yushankhai, Liviu Hozoi, Hermann Stoll, Jeroen van den Brink |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Science
Ab initio General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 01 natural sciences Quantum chemistry Article Strongly correlated electrons General Biochemistry Genetics and Molecular Biology Condensed Matter - Strongly Correlated Electrons Magnetic properties and materials Lattice (order) 0103 physical sciences Hexagonal lattice Quantum information 010306 general physics Anisotropy Phase diagram Physics Multidisciplinary Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) General Chemistry Spintronics 021001 nanoscience & nanotechnology Condensed Matter::Strongly Correlated Electrons Quantum spin liquid 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 7, Iss 1, Pp 1-7 (2016) |
| DOI: | 10.34657/4975 |
| Popis: | In quantum magnetism spin dimers are typically associated with spin-singlet states. To date, $triplet$ $dimerization$ has not been observed in any 3D or quasi-2D material. With this in mind we here discuss the electronic structure of the spin-orbit driven $5d^5$ Mott insulator Li$_2$IrO$_3$, a honeycomb-lattice system with two crystallographically inequivalent Ir-Ir bonds. From $ab$ $initio$ many-body calculations we find that, while both Heisenberg and Kitaev couplings are present, the magnetic interactions are dominated by a strong isotropic ferromagnetic exchange on only one set of bonds. This causes the formation of triplet spin dimers effectively placed on a strongly frustrated triangular lattice. The triplet dimers remain protected in a large region of the phase diagram, suggesting that Li$_2$IrO$_3$ has a long-range incommensurate magnetic ground state that is pushed by the Kitaev exchange interactions beyond a standard planar helix configuration. Comment: 5 pages, 3 figures, revised from the previous version |
| Databáze: | OpenAIRE |
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