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  Frustrated two dimensional quantum magnets

Schmidt, B., & Thalmeier, P. (2017). Frustrated two dimensional quantum magnets. Physics Reports: Review Section of Physics Letters, 703, 1-59. doi:10.1016/j.physrep.2017.06.004.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-1886-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-1889-3
Genre: Journal Article

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 Creators:
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: We overview physical effects of exchange frustration and quantum spin fluctuations in (quasi-) two dimensional (2D) quantum magnets (S = 1/2) with square, rectangular and triangular structure. Our discussion is based on the J(1)-J(2) type frustrated exchange model and its generalizations. These models are closely related and allow to tune between different phases, magnetically ordered as well as more exotic nonmagnetic quantum phases by changing only one or two control parameters. We survey ground state properties like magnetization, saturation fields, ordered moment and structure factor in the full phase diagram as obtained from numerical exact diagonalization computations and analytical linear spin wave theory. We also review finite temperature properties like susceptibility, specific heat and magnetocaloric effect using the finite temperature Lanczos method. This method is powerful to determine the exchange parameters and g-factors from experimental results. We focus mostly on the observable physical frustration effects in magnetic phases where plenty of quasi-2D material examples exist to identify the influence of quantum fluctuations on magnetism. (C) 2017 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2017-08-312017-08-31
 Publication Status: Published in print
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Title: Physics Reports: Review Section of Physics Letters
Source Genre: Journal
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Publ. Info: Amsterdam : North-Holland
Pages: - Volume / Issue: 703 Sequence Number: - Start / End Page: 1 - 59 Identifier: ISSN: 0370-1573
CoNE: /journals/resource/954925524775