Abstract
An antiferromagnetic system on a 2-D triangular lattice leads to geometric topological frustration. This ideal system has been the subject of theoretical investigations. One experimental realization of this system is the compound Cs2CuCl4. Various magnetization, heat capacity, neutron scattering and NMR studies have identified several magnetic transitions when the magnetic field is applied along one of the three principal axes. The current work investigates the evolution of these phases at intermediate angles as the crystal is rotated relative to the magnetic field. These phases were investigated using a novel rotating calorimeter allowing complete coverage of the experimental parameter space. New magnetic phases only existing at intermediate angles have been found.
Highlights
Geometric frustration for an antiferromagnetic system has long been studied on a 2-D triangular lattice as the simplest realization of the phenomenon
Further work by Tokiwa et al [5] extended the phase diagram to fields applied along the b axis and c axis
As the magnetic field is swept while holding the sample at constant temperature in the calorimeter, the transitions between phases will involve either a peak in heat capacity or a latent heat depending on the nature of the transition
Summary
Geometric frustration for an antiferromagnetic system has long been studied on a 2-D triangular lattice as the simplest realization of the phenomenon. Further work by Tokiwa et al [5] extended the phase diagram to fields applied along the b axis (along the triangle bases) and c axis. The current work utilizes a unique low temperature rotatable calorimeter [7] using magnetocaloric effects to map the evolution of these phases as the magnetic field is rotated between the principal axes of the lattice.
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