Abstract
The transition caused by a change in the ground state of a rare-earth ion upon level crossing, an analogue of the induced Jahn-Teller transition in rare-earth compounds, is observed. It is shown that a jumpwise change in the Jahn-Teller interactions of α and γ symmetries, caused by a change in the corresponding quadrupole moments in DyPO4 upon level crossing, diminishes the critical field by ∼20 kOe and leads to a sharper change in magnetization M and differential magnetic susceptibility dM/dH near the crossover point.
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