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Anomalies of Magnetostriction of DyPO 4 Caused by Interaction of Levels

Anomalies of the linear magnetostriction caused by the interaction of energy levels of the rare-earth ion in DyPO 4 in a strong magnetic field along the (100) and (110) axes are investigated both experimentally and theoretically. Smeared jumps and maxima on the magnetostriction curve λ ( H ) and its derivative d λ ( H )/ dH along the three orthogonal axes in the critical fields H c = 140 and 200 kOe, when the lower energy levels of the Dy 3+ ion converge, are discovered. Under the assumption of the adiabatic property of the magnetization process in pulsed fields, the quadrupolar moments , , and → P xy ─ are calculated, which give a rather accurate description of the anisotropy of the linear magnetostriction λ ( H ) and its dependence on temperature and mag- netic field. It is discovered that jump-like variation of the quadrupolar interaction of α and γ ( δ ) symmetry in DyPO 4 under crossover leads, according to the experiment, to the decrease of the critical field by about 20 kOe and a more sharp change of the linear magnetostriction λ ( H ) and its derivative d λ ( H )/ dH in the vicinity of the crossover. © 2001 MAIK "Nauka/Interperiodica". O2 →─ O2 →─