Distinct magnetic regimes through site-selective atom substitution in the frustrated quantum antiferromagnet Cs 2CuCl 4-xBr x

P. T. Cong, B. Wolf, M. De Souza, N. Krüger, A. A. Haghighirad, S. Gottlieb-Schoenmeyer, F. Ritter, W. Assmus, I. Opahle, K. Foyevtsova, Harald Olaf Jeschke, R. Valentí, L. Wiehl, M. Lang

Research output: Contribution to journalArticle

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Abstract

We report on a systematic study of the magnetic properties on single crystals of the solid solution Cs 2CuCl 4-xBr x (0 ≤ x ≤ 4), which include the two known end-member compounds Cs 2CuCl 4 and Cs 2CuBr 4, classified as quasi-two-dimensional quantum antiferromagnets with different degrees of magnetic frustration. By comparative measurements of the magnetic susceptibility χ(T) on as many as 18 different Br concentrations, we found that the in-plane and out-of-plane magnetic correlations, probed by the position and height of a maximum in the magnetic susceptibility, respectively, do not show a smooth variation with x. Instead, three distinct concentration regimes can be identified, which are separated by critical concentrations x c1 =; 1 and x c2 =2. This unusual magnetic behavior can be explained by considering the structural peculiarities of the materials, especially the distorted Cu-halide tetrahedra, which support a site-selective replacement of Cl - by Br - ions. Consequently, the critical concentrations x c1 (x c2) mark particularly interesting systems, where one (two) halide-sublattice positions are fully occupied.

Original languageEnglish
Article number064425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number6
DOIs
Publication statusPublished - Feb 11 2011
Externally publishedYes

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Magnetic susceptibility
Substitution reactions
substitutes
Atoms
halides
atoms
Solid solutions
Magnetic properties
Single crystals
Ions
magnetic permeability
frustration
tetrahedrons
sublattices
solid solutions
magnetic properties
single crystals
ions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Distinct magnetic regimes through site-selective atom substitution in the frustrated quantum antiferromagnet Cs 2CuCl 4-xBr x. / Cong, P. T.; Wolf, B.; De Souza, M.; Krüger, N.; Haghighirad, A. A.; Gottlieb-Schoenmeyer, S.; Ritter, F.; Assmus, W.; Opahle, I.; Foyevtsova, K.; Jeschke, Harald Olaf; Valentí, R.; Wiehl, L.; Lang, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 6, 064425, 11.02.2011.

Research output: Contribution to journalArticle

Cong, PT, Wolf, B, De Souza, M, Krüger, N, Haghighirad, AA, Gottlieb-Schoenmeyer, S, Ritter, F, Assmus, W, Opahle, I, Foyevtsova, K, Jeschke, HO, Valentí, R, Wiehl, L & Lang, M 2011, 'Distinct magnetic regimes through site-selective atom substitution in the frustrated quantum antiferromagnet Cs 2CuCl 4-xBr x', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 6, 064425. https://doi.org/10.1103/PhysRevB.83.064425
Cong, P. T. ; Wolf, B. ; De Souza, M. ; Krüger, N. ; Haghighirad, A. A. ; Gottlieb-Schoenmeyer, S. ; Ritter, F. ; Assmus, W. ; Opahle, I. ; Foyevtsova, K. ; Jeschke, Harald Olaf ; Valentí, R. ; Wiehl, L. ; Lang, M. / Distinct magnetic regimes through site-selective atom substitution in the frustrated quantum antiferromagnet Cs 2CuCl 4-xBr x. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 83, No. 6.
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