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Report No.

Single crystal growth and crystal structure of ThRhIn$$_5$$ and LuCoGa$$_5$$

Matsuda, Tatsuma; Haga, Yoshinori; Sakai, Hironori; Ikeda, Shugo; Onuki, Yoshichika

Recently quasi-two-dimensional electron state in rare earth and actinide compounds with HoCoGa$$_5$$-type tetragonal crystal structure was attracted a lot attention in relation to heavy fermion superconductivity observed in CeCoIn$$_5$$, CeIrIn$$_5$$ and PuCoGa$$_5$$. In order to elucidate the role of $$f$$ electron in these compounds, it is necessary to compare their electronic state with that of lanthanum and thorium compounds which do not possess the $$f$$-electrons. The number of valence electrons in the thorium compound is the same as that of the corresponding 4$$f^1$$-itinerant cerium compound. We have recently tried to make thorium 115 compounds by indium flux method and have succeeded in discovering the new material of ThRhIn$$_5$$. Crystal structure and quality were confirmed by X-ray diffraction, fluorescent X-ray analysis and EPMA. The lattice parameters were determined to be 4.681(6) $AA and 7.54(1) AA for $a$$ and $$c$$, respectively. The positional parameter $$z$$ of In(4$$i$$) site was also determined to be $$z=0.3069(1)$$.



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