Distinct magnetic regimes through site-selective atom substitution in the frustrated quantum antiferromagnet Cs${}_2$CuCl${}_{4-x}$Br${}_x$

Abstract

We report on a systematic study of the magnetic properties on single crystals of the solid solution Cs${}_2$CuCl${}_{4-x}$Br${}_x$ (0 $\le$ x $\le$ 4), which include the two known end-member compounds Cs${}_2$CuCl${}_4$ and Cs${}_2$CuBr${}_4$, classified as quasi-two-dimensional quantum antiferromagnets with different degrees of magnetic frustration. By comparative measurements of the magnetic susceptibility $\chi$($T$) on as many as eighteen different Br concentrations, we found that the inplane 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) halidesublattice positions are fully occupied.

15 pages, 4 figures

References in corpus (8)

• Dimensional reduction at a quantum critical point
• Bose-Einstein Condensation of Magnons in Cs2CuCl4
• Extreme sensitivity of a frustrated quantum magnet: Cs_2CuCl_4
• Interplay of Quantum Criticality and Geometric Frustration in Columbite
• Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
• Determination of effective microscopic models for the frustrated antiferromagnets Cs${}_2$CuCl${}_4$ and Cs${}_2$CuBr${}_4$ by density functional methods
• The stable phases of the Cs2CuCl4-xBrx mixed systems
• First principles perspective on the microscopic model for Cs2CuCl4 and Cs2CuBr4

Cited by in corpus (20)

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• Thermodynamics of anisotropic triangular magnets with ferro- and antiferromagnetic exchange
• One-dimensional spin liquid, collinear, and spiral phases from uncoupled chains to the triangular lattice
• Quantum domain walls induce incommensurate supersolid phase on the anisotropic triangular lattice
• Quantum fluctuations in anisotropic triangular lattices with ferro- and antiferromagnetic exchange
• Specific Heat Study of 1D and 2D Excitations in the Layered Frustrated Quantum Antiferromagnets Cs${}_2$CuCl${}_{4-x}$Br${}_x$
• Spin correlations and Dzyaloshinskii-Moriya interaction in Cs${}_2$CuCl${}_4$
• (CuCl)LaTa2O7 and quantum phase transition in the (CuX)LaM2O7 family (X = Cl, Br; M = Nb, Ta)
• Low-temperature structural investigations of the frustrated quantum antiferromagnets Cs2CuCl(4-x)Br(x)
• Magnetic properties and Mott transition of the Hubbard model for weakly coupled chains on the anisotropic triangular lattice
• Hard-core boson approach to the spin-1/2 triangular-lattice antiferromagnet Cs${}_2$CuCl${}_4$ at finite temperatures in magnetic fields higher than the saturation field
• Tetragonal mixed system $C{s}_{2}CuC{l}_{4-x}B{r}_x$ complemented by the tetragonal phase realisation of $C{s}_{2}CuC{l}_4$
• Magnetic phase diagram of the triangular antiferromagnetic $C{s}_{2}CuC{l}_{4-x}B{r}_x$ mixed system
• Magneto-structural properties of the layered quasi-2D triangular-lattice antiferromagnets Cs${}_2$CuCl${}_{4-x}$Br${}_x$ for $x$ = 0,1,2 and 4
• Spin relaxation in Cs${}_2$CuCl${}_{4-x}$Br${}_x$
• Structural variations and magnetic properties of the quantum antiferromagnets Cs2CuCl4-xBrx
• Strengthening the magnetic interactions in pseudobinary first-row transition metal thiocyanates, $M$(NCS)${}_2$