Anisotropic exchange in ErSb

The correlations of the magnetic moments and the magnetic order parameter of ErSb have been studied by neutron diffraction. The antiferromagnetic phase transition is of first order. The diffuse paramagnetic scattering is evaluated in terms of magnetic coupling tensors which are characterized by a strong two-ion anisotropy.

Magnetic excitations in TbP under hydrostatic pressure

Singlet ground state magnets still attract much attention. In these systems magnetic ordering occurs via the polarization of the ground state, and noticeable dispersion of well defined excitations is expected in systems where the exchange coupling is about equal to the crystal field energy. In addition, the two singlet-triplet systems PrSbl and TbP2 where single crystals are available and which have been studied in detail showed a pronounced splitting of the Г1–Г4 magnetic excitations where the triple degeneracy was lifted along [100] and [011] by a strong anisotropy of the exchange.

Probe Coherence Volume and the Interpretation of Scattering Experiments