[Zurück]

H. Michor:
"Crystal Growth and Studies of Physical Properties of Ho- and Lu Transition Metal (Co, Ni) Dicarbides";
Vortrag: faculty seminar at faculty of technical physics and applied mathematics, Gdansk University of Technology, Danzig, Polen (eingeladen); 26.01.2018.

Ternary carbides RNiC2 (R = La, .. Lu) and RCoC2 (R = Nd, .. Lu) crystallize in the non-centrosymmetric orthorhombic CeNiC2-type structure, space group Amm2. These compounds attracted attention because of various interesting properties such as exotic superconductivity in LaNiC2, observation of charge density wave (CDW) formation related to quasi-one-dimensional electronic features and Fermi surface nesting in RNiC2 with R = Pr, .. Ho, .. and, finally, the complex interplay of CDW ordering with rare earth magnetism in RNiC2.
In the present talk, we report on crystal growth, crystallographic characteristics, magnetic and electronic properties studied by magnetization, specific heat and electrical resistivity measurements with focus on two systems, one with and one without rare earth magnetism: HoCo1-хNiхC2 and LuCo1-хNiхC2 (0 ≤ x ≤ 1). Our experimental studies on LuCoC2 and LuNiC2 are supplemented by DFT electronic structure studies aiming to reveal Fermi surface features related to CDW ordering as well as interrelations between features and anisotropy of electronic transport properties and the Fermi surface topology of bands with quasi-one-dimensional and others with three dimensional characters.