Abstract
We have succeeded in growing a high-quality single crystal of UIr with the monoclinic structure by the Czochralski pulling method in a tetra-arc furnace. UIr is a ferromagnetic compound. Its Curie temperature TC is 46K and the magnetic moment is found to be oriented along the [101̄] direction by the magnetization measurement. The magnetic moment is 0.5μB/U. We have observed the de Haas-van Alphen oscillation. All the detected branches have heavy cyclotron effective masses ranging from 9.6 to 32m0. They are consistent with the electronic specific heat coefficient γ=48.5mJ/K2mol.
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