Substitutional Disorder Effect on the Ising-axis Conversion in (Tb0.5Y0.5)Cu2
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The thermodynamic properties and the results of the Ising-axis conversion of the (Tb0.5Y0.5)Cu2 single crystal are presented. The expected weakening of the magnetic exchange caused by the Y substitution is documented by the lowering of the Néel temperature from T N =54 K for pure TbCu2 down to T N =30 K for (Tb0.5Y0.5)Cu2. Simultaneously, the specific heat data do not show a sharp anomaly at the ordering temperature, the broad transition points to a clustering of Tb and Y ions in the crystal structure. On the other hand, the critical field of the Ising-axis conversion as well as its temperature dependence in (Tb0.5Y0.5)Cu2 is about the same as in pure TbCu2 which confirms the quadrupolar interaction as the driving force of the conversion process.
Keywordsaxis conversion RCu2 metamagnetic transition
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