Neutron and EPR study of Cu(tn)Cl2 -A two-dimensional spatially anisotropic triangular-lattice antiferromagnet

Abstract

We have studied the temperature dependence of the lattice parameters and the in uence of spin anisotropy on the electron paramagnetic spectra of Cu(tn)Cl2, an S = 1=2 quasi-two-dimensional spatially-anisotropic triangularlattice Heisenberg antiferromagnet. The variation of the resonance fields with temperature reflects the presence of an easy-plane exchange anisotropy with Jz=Jx,y < 1 and g-factor anisotropy, gz=gx,y > 1.