Magnetization of the KDy(WO 4 ) 2 single crystal in paramagnetic phase

We report on the temperature and pressure dependences of the magnetization in the KDy(W04)2 single crystal. The directions ofmagnetic axes in the ciystal under study were established. It has been shown that at the point ofthe structural phase transition theCurie-Weiss temperature changes considerably. Under pressure ofabout 0.8 GPa the temperature ofthe structural phase transitionincreases nearly by a factor oftwo. As a result ofthe pressure effect the low temperature phase area is expanded. Keywords: KDy(W04)2, double tungstates, phase transition, cooperative Jahn-TeIler effect, magnetization, magnetizationunder pressure, constants ofexchange interactions, Curie-Weiss temperature 1. INTRODUCTION Investigations ofmagnetic resonance and thermal properties ofthe KDy(W04)2 double tungstate ' have shown that this compound is ofinterest because of structural and magnetic phase transitions observed in this low-dimensional magnetic material. The Jahn-Teller type structural phase transition (SPT) at Tp1- 6.38 K and the antilerromagnetic (AFM) phase transition at