Abstract
We grew single crystals of TbCoGa5 and measured the magnetic susceptibility, magnetization curves, specific heat and ultrasonic properties. The results of the magnetic susceptibility and specific heat measurements suggest that TbCoGa5 shows successive component-separated magnetic transition and the degeneracy of quadrupolar degrees of freedom is not fully lifted in intermediate phase. The softening of the elastic constant C44 indicates that the degeneracy of electric-quadrupolar (orbital) degrees of freedom exists in spite of the formation of magnetic order. We have considered that the degeneracy of quadrupolar degrees of freedom is important for the occurrence of successive component-separated magnetic transition.
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