Successive magnetic orderings of rectangular components caused by conservation of paraquadrupolar state in magnetically ordered phase in TbCoGa5

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  • Sanada Naoyuki
    Department of Advanced Materials Chemistry, Yokohama National University
  • Watanuki Ryuta
    Department of Advanced Materials Chemistry, Yokohama National University
  • Suzuki Kazuya
    Department of Advanced Materials Chemistry, Yokohama National University
  • Akatsu Mitsuhiro
    Graduate School of Science and Technology, Niigata University
  • Sakakibara Toshiro
    The Institute for Solid State Physics, the University of Tokyo

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  • Successive Magnetic Orderings of Rectangular Components Caused by Conservation of Paraquadrupolar State in Magnetically Ordered Phase in TbCoGa<SUB>5</SUB>

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We grew single crystals of TbCoGa5 and measured their magnetic susceptibility, specific heat, and elastic constants. The result of the magnetic susceptibility measurement suggests that the c- and ab-components of the magnetic moments of Tb3+ ions order independently at TN1=36.2 K and TN2=5.4 K, respectively. The magnetic entropy change indicates that the degeneracy of internal degrees of freedom is not fully lifted in the intermediate phase. In addition, the degeneracy of electric-quadrupolar (orbital) degrees of freedom exists in spite of the formation of magnetic order because the elastic constants show softening in the intermediate phase. It is considered that the magnetic ordering of the ab-component is suppressed by the existence of the degeneracy of quadrupolar degrees of freedom in TbCoGa5.

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