Magnetic phase diagram of the triangular antiferromagnetic $C{s}_{2}CuC{l}_{4-x}B{r}_x$ mixed system

Abstract

The novel magnetic phase diagram of the $C{s}_{2}CuC{l}_{4-x}B{r}_x$ mixed system is established by means of single crystal neutron diffraction in the lowest temperature region and zero magnetic field. Two long-range ordered magnetic phases exist in this mixed system depending on the Cl/Br concentration. In the rich Cl concentration range, the ordered magnetic state occurs below the ordering temperature $T_N=0.51(1)K$ for $C{s}_{2}CuC{l}_{3}B{r}_1$ and at $C{s}_{2}CuC{l}_{2.6}B{r}_{1.4}$ below $T_N=0.24(2)K$. Magnetic order with a temperature-independent position $(0,0.573(1),0)$ below the ordering temperature $T_N=0.63(1)K$ appears in the rich Br concentration for $C{s}_{2}CuC{l}_{0.6}B{r}_{3.4}$. Between the rich Cl and rich Br concentration ranges (two magnetic phases), there is a range of x without magnetic order down to $50mK$. A suggestion about the magnetic exchange paths in the $bc$-layer for different regimes is presented, which can be controlled depending on the preferred Br-occupation in the [CuX4] tetrahedra. The density functional theory (DFT) calculations of the exchange coupling constants J, J^' for some ordered compositions of the mixed system $C{s}_{2}CuC{l}_{4-x}B{r}_x$ indicate that these are not frustrated.

References in corpus (15)

• Experimental realization of a 2D fractional quantum spin liquid
• Quantum Criticality
• Observation of extended scattering continua characteristic of spin fractionalization in the 2D frustrated quantum magnet Cs2CuCl4 by neutron scattering
• Direct Measurement of the Spin Hamiltonian and Observation of Condensation of Magnons in the 2D Frustrated Quantum Magnet Cs2CuCl4
• Experimental evidence for bulk superconductivity in pure Bismuth single crystal at ambient pressure
• Spinons and triplons in spatially anisotropic frustrated antiferromagnets
• Quantum and classical criticality in a dimerized quantum antiferromagnet
• Temperature Dependence of the Magnetic Susceptibility for Triangular-Lattice Antiferromagnets with spatially anisotropic exchange constants
• Direct determination of exchange parameters in Cs2CuBr4 and Cs2CuCl4: high-field ESR studies
• 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
• The multi-purpose three-axis spectrometer (TAS) MIRA at FRM II
• Distinct magnetic regimes through site-selective atom substitution in the frustrated quantum antiferromagnet Cs${}_2$CuCl${}_{4-x}$Br${}_x$
• High-Temperature Series Expansion for Spin-1/2 Heisenberg Models
• Low-temperature structural investigations of the frustrated quantum antiferromagnets Cs2CuCl(4-x)Br(x)

Cited by in corpus (4)

• Spin excitations in the frustrated triangular lattice antiferromagnet NaYbO${}_2$
• Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs${}_2$CuCl${}_4$
• Tetragonal mixed system $C{s}_{2}CuC{l}_{4-x}B{r}_x$ complemented by the tetragonal phase realisation of $C{s}_{2}CuC{l}_4$
• Spin relaxation in Cs${}_2$CuCl${}_{4-x}$Br${}_x$