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  Magneto-Structural Properties of the Layered Quasi-2D Triangular-Lattice Antiferromagnets Cs2CuCl4-xBrx for x =0, 1, 2, and 4

Thallapaka, S. K., Wolf, B., Gati, E., Postulka, L., Tutsch, U., Schmidt, B., et al. (2019). Magneto-Structural Properties of the Layered Quasi-2D Triangular-Lattice Antiferromagnets Cs2CuCl4-xBrx for x =0, 1, 2, and 4. Physica Status Solidi B, 1900044, pp. 1-8. doi:10.1002/pssb.201900044.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-BDE6-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-BDEA-1
Genre: Journal Article

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Thallapaka, Satya K.1, Author
Wolf, Bernd1, Author
Gati, Elena1, Author
Postulka, Lars1, Author
Tutsch, Ulrich1, Author
Schmidt, Burkhard2, Author              
Thalmeier, Peter3, Author              
Ritter, Franz1, Author
Krellner, Cornelius1, Author
Li, Ying1, Author
Borisov, Vladislav1, Author
Valentí, Roser1, Author
Lang, Michael1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863464              
3Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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 Abstract: A study of the magnetic susceptibility under variable hydrostatic (He gas) pressure on single crystals of Cs2CuCl4−xBrx is presented. This work includes the border compounds x = 0 and 4, known as good realizations of the distorted triangular-lattice spin-1/2 Heisenberg antiferromagnet, as well as the recently discovered well-ordered isostructural systems Cs2CuCl3Br1 and Cs2CuCl2Br2. For the determination of the exchange coupling constants J and J′ of their anisotropic triangular lattice, the susceptibility data are fitted by the recently proposed J–J′ model [Schmidt and Thalmeier, New J. Phys. 2015, 17, 073025]. Its application on magnetic susceptibility data, validated for the border compounds, yields a degree of frustration J′/J = 0.47 for Cs2CuCl3Br1 and J′/J ≃ 0.63–0.78 for Cs2CuCl2Br2, making these systems particular interesting representatives of this family. From the evolution of the magnetic susceptibility under pressure up to about 0.4 GPa, the maximum pressure applied, two observations were made for all the compounds investigated here. First, it has been found that the overall energy scale, given by Jc = (J2 + J′2)1/2, increases under pressure, whereas the ratio J′/J remains unchanged in this pressure range. These experimental observations are in accordance with the results of DFT calculations performed for these materials. Secondly, for the magnetoelastic coupling constants, extraordinarily small values are obtained, about two orders of magnitude smaller compared to other Cu-based quantum magnets. These observations have been assigned to a structural peculiarity of this class of materials, consisting of well-isolated magnetic units not sharing any common coordination element. © 2019 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim

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Language(s): eng - English
 Dates: 2019-05-152019-05-15
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/pssb.201900044
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Title: Physica Status Solidi B
  Abbreviation : Phys. Status Solidi B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: - Sequence Number: 1900044 Start / End Page: 1 - 8 Identifier: ISSN: 0370-1972
CoNE: https://pure.mpg.de/cone/journals/resource/958480240330