Symmetry analysis of the possible low-temperature phases in KDy(MoO4)2

The possible asymmetric phases in the Jahn-Teller crystal of KDy(MoO4)2 are analyzed. Phases appearing upon a second-order phase transition from an orthorhombic D 2 14 group with the unit cell volume doubling are described. It is shown that KDy(MoO4)2 crystals are capable of featuring the Jahn-Teller pseudoeffect caused by the interaction between the electron states of dysprosium ions and the compressive (tensile) or shear deformations.

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