期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5203
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资金
- US Department of Energy, Office of Basic Energy Sciences and Materials Sciences and Engineering Division [DE-AC02-05CH11231]
- Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under the US Department of Energy [DE-AC02-05CH11231]
- National Science Foundation Graduate Research Fellowship [DGE 1106400]
- NSF-DMR [1063735]
- BES-'Science of 100 tesla'
- EPSRC (UK) [EP/H014934/1]
- National High Magnetic Field Laboratory [NSF/DMR 1157490]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1063735] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1358975] Funding Source: National Science Foundation
Spin and orbital quantum numbers play a key role in the physics of Mott insulators, but in most systems they are connected only indirectly-via the Pauli exclusion principle and the Coulomb interaction. Iridium-based oxides (iridates) introduce strong spin-orbit coupling directly, such that these numbers become entwined together and the Mott physics attains a strong orbital character. In the layered honeycomb iridates this is thought to generate highly spin-anisotropic magnetic interactions, coupling the spin to a given spatial direction of exchange and leading to strongly frustrated magnetism. Here we report a new iridate structure that has the same local connectivity as the layered honeycomb and exhibits striking evidence for highly spin-anisotropic exchange. The basic structural units of this material suggest that a new family of three-dimensional structures could exist, the 'harmonic honeycomb' iridates, of which the present compound is the first example.
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