1 research outputs found
Magneto-structural properties of the layered quasi-2D triangular-lattice antiferromagnets CsCuClBr for = 0,1,2 and 4
We present a study of the magnetic susceptibility under variable
hydrostatic pressure on single crystals of CsCuClBr. This
includes the border compounds \textit{x} = 0 and 4, known as good realizations
of the distorted triangular-lattice spin-1/2 Heisenberg antiferromagnet, as
well as the isostructural stoichiometric systems CsCuClBr and
CsCuClBr. For the determination of the exchange coupling
constants and , data were fitted by a
model \cite{Schmidt2015}. Its application, validated for the
border compounds, yields a degree of frustration / = 0.47 for
CsCuClBr and / 0.63 - 0.78 for
CsCuClBr, 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, we find that the overall energy scale, given by +
), increases under pressure, whereas the ratio
/ 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. We assign these observations to a
structural peculiarity of this class of materials