The magnetic phase diagram of EuTe for high external pressure

The magnetic phase diagram of europium telluride, EuTe, under external high pressure is theoretically investigated. The modified Molecular Field Appro ximation involving the quadrupolar moment calculations is adopted. Besides nearest-neighbour (n.n.) and next-nearest-neighbour (n.n.n.) exchange inter actions, the long-range dipolar and biquadratic interactions are taken into account. The functional dependencies of n.n. and n.n.n. bilinear interacti ons on the lattice constant are obtained, under the requirement that the ca lculated Neel and Curie temperatures reproduce the experimental data.