Anisotropic Cooperative Jahn-Teller Effect and Metamagnetism in PrCu_2

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We have studied the origin of the cooperative Jahn-Teller effect and the metamagnetic transi-tion in the orthorhombic cornpotrnd PrCtn3. We have determined the anisotropic ferroquadrtupolephase diagram by measuring the specific heat and thermal expansion under magnetic fields.With increasing the field, the Jahn-Teller transition temperature increases slightly for the fieldalong a- and c-axes, while it decreases intensively along the 6-axis. The phase diagram canbe explained quantitatively by including the quadrupolar interaction of -Kz-r 4Ox.) O.. in thecrystalline electric field and Zeernan Hamiltonian. The metamagnetic transition, which bringsabout the conversion between the easy (o)- and hard (c)-axes magnetization, has been also sttrd-led througlt the magnetostriction. This phenomenon is also explained quantitatively on the basisof the qtradrtnpolar interaction of -K? (O:) O:. The sign of (O',) is found to be negative inthe state where the c-axis is the hard one, while it changes from negatuve to posntuve above thernetarnagnetic transition field.
社団法人日本物理学会の論文
1998-02-15