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  Quantum fluctuations in anisotropic triangular lattices with ferromagnetic and antiferromagnetic exchange

Schmidt, B., & Thalmeier, P. (2014). Quantum fluctuations in anisotropic triangular lattices with ferromagnetic and antiferromagnetic exchange. Physical Review B, 89(18): 184402, pp. 1-12. doi:10.1103/PhysRevB.89.184402.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-907E-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-907F-6
Genre: Journal Article

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Schmidt, Burkhard1, Author              
Thalmeier, Peter2, Author              
Affiliations:
1Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863464              
2Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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 Abstract: The Heisenberg model on a triangular lattice is a prime example of a geometrically frustrated spin system. However most experimentally accessible compounds have spatially anisotropic exchange interactions. As a function of this anisotropy, ground states with different magnetic properties can be realized. Motivated by recent experimental findings on Cs2CuCl4-xBrx, we discuss the full phase diagram of the anisotropic model with two exchange constants J(1) and J(2), including possible ferromagnetic exchange. Furthermore a comparison with the related square lattice model is carried out. We discuss the zero-temperature phase diagram, ordering vector, ground-state energy, and ordered moment on a classical level and investigate the effect of quantum fluctuations within the framework of spin-wave theory. The field dependence of the ordered moment is shown to be nonmonotonic with field and control parameter.

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 Dates: 2014-05-01
 Publication Status: Published in print
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 89 (18) Sequence Number: 184402 Start / End Page: 1 - 12 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008