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Matsuda, Tatsuma; Haga, Yoshinori; Sakai, Hironori; Ikeda, Shugo; Onuki, Yoshichika
Journal of the Physical Society of Japan, 75(Suppl.), p.85 - 87, 2006/08
Recently quasi-two-dimensional electron state in rare earth and actinide compounds with HoCoGa-type tetragonal crystal structure was attracted a lot attention in relation to heavy fermion superconductivity observed in CeCoIn
, CeIrIn
and PuCoGa
. In order to elucidate the role of
electron in these compounds, it is necessary to compare their electronic state with that of lanthanum and thorium compounds which do not possess the
-electrons. The number of valence electrons in the thorium compound is the same as that of the corresponding 4
-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
. 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)
and
, respectively. The positional parameter
of In(4
) site was also determined to be
.