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  Thermodynamics of anisotropic triangular magnets with ferro- and antiferromagnetic exchange

Schmidt, B., & Thalmeier, P. (2015). Thermodynamics of anisotropic triangular magnets with ferro- and antiferromagnetic exchange. New Journal of Physics, 17: 073025, pp. 1-15. doi:10.1088/1367-2630/17/7/073025.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-5344-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-321B-D
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: Weinvestigate thermodynamic properties like specific heat cV and susceptibility chi in anisotropic J(1)-J(2) triangular quantum spin systems (S = 1/2). As a universal tool we apply the finite temperature Lanczos method (FTLM) based on exact diagonalization of finite clusters with periodic boundary conditions. Weuse clusters up to N = 28 sites where the thermodynamic limit behavior is already stably reproduced. As a reference we also present the full diagonalization of a small eight-site cluster. After introducing model and method we discuss our main results on c(V)(T) and chi(T). We show the variation of peak position and peak height of these quantities as function of control parameter J(2)/J(1). We demonstrate that maximum peak positions and heights in Nuel phase and spiral phases are strongly asymmetric, much more than in the square lattice J(1)-J(2) model. Our results also suggest a tendency to a second side maximum or shoulder formation at lower temperature for certain ranges of the control parameter. Wefinally explicitly determine the exchange model of the prominent triangular magnets Cs2CuCl4 and Cs2CuBr4 from our FTLM results.

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 Dates: 2015-07-222015-09-02
 Publication Status: Published in print
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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 17 Sequence Number: 073025 Start / End Page: 1 - 15 Identifier: ISSN: 1367-2630
CoNE: /journals/resource/954926913666