[Zurück]

H. Michor:
"Synthesis and Physical Properties of HoNiC₂-HoCoC₂ and LuNiC₂-LuCoC₂ Solid Solutions";
Vortrag: Seminar of the Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Lemberg, Ukraine (eingeladen); 21.09.2017.

Ternary carbides RNiC2 (R = La, .. Lu) and RCoC2 (R = Nd, .. Lu) crystallize in the non-centrosymmetric orthorhombic CeNiC2-type structure, space group Amm2 [1,2]. These compounds attracted attention because of various interesting properties such as exotic superconductivity in LaNiC2 (e.g. [3]), observation of charge density wave (CDW) formation related to quasi-one-dimensional electronic features and Fermi surface nesting in RNiC2 with R = Pr, .. Tb, and its interplay with rare earth magnetism [4].
In the present talk, we report on crystallographic characteristics, magnetic and electronic properties studied by magnetization, specific heat and electrical resistivity measurements on two series of polycrystalline solid solutions magnetic HoCo1-хNiхC2 and essentially non-magnetic LuCo1-хNiхC2 (0 ≤ x ≤ 1). For complementary studies single crystals of HoCoC2, LuCoC2, and LuNiC2 were grown by the Czochralski technique. Our experimental studies are supplemented by DFT electronic structure studies aiming to reveal the origin of the cross-over from the quasi-one-dimensional electronic features of HoNiC2 and LuNiC2 towards a conventional three dimensional electronic behaviour of HoCoC2 and LuCoC2.

[1] O. I. Bodak, E. P. Marusin, V. A. Bruskov, Sov. Phys. Crystallogr. 25 (1980) 355.
[2] W. Jeitschko, M. H. Gerss, J. Less-Common Met.116 (1986) 147.
[3] T. Yanagisawa and I. Hase, J. Phys. Soc. Jpn. (JPSJ) 81 (2012) SB039.
[4] M. Murase et al., JPSJ 73 (2004) 2790; N. Yamamoto et al., JPSJ 82 (2013) 123701.

Ternary carbides, magnetism, charge density wave