Volume 103, Number 4, August 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 September 2013|
Interlayer magnetic-frustration–driven quantum spin disorder in the honeycomb compound In3Cu2VO9
1 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences P. O. Box 1129, Hefei, Anhui 230031, China
2 College of Physics Science and Technology, Hebei University - Baoding 071002, China
3 Department of Physics, Chinese University of Hong Kong - Shatin, New Territory, Hong Kong, China
Received: 24 April 2013
Accepted: 13 August 2013
In this paper we present the electronic and magnetic properties of the honeycomb compound In3Cu2VO9. We find that the band dispersions display Dirac cone features in the nonmagnetic phase, as observed in graphene. The parent phase is a charge transfer insulator with an energy gap of about 1.5 eV. Singly occupied electrons of copper ions contribute an spin, while vanadium ions show nonmagnetism. The planar nearest-neighbor, next-nearest-neighbor and interplane superexchange couplings of Cu spins are , and , suggesting a low-dimensional antiferromagnet rather than a spin liquid. We propose that the magnetic frustration along the c-axis leads to a quantum spin disorder in In3Cu2VO9, in accordance with recent experiments.
PACS: 71.20.-b – Electron density of states and band structure of crystalline solids / 75.10.Kt – Quantum spin liquids, valence bond phases and related phenomena / 75.25.-j – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
© EPLA, 2013
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