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

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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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    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, H. O., 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, 83(6), [064425]. https://doi.org/10.1103/PhysRevB.83.064425