[Zurück]

H. Michor, S. Steiner, A. Schumer, M. Hembara, V. Levytskyy, V. Babizhetskyy, B. Kotur:
"Magnetic properties of HoCoC₂, HoNiC₂ and their solid solutions";
Journal of Magnetism and Magnetic Materials, 441 (2017), S. 69 - 75.

Magnetic properties of single crystalline HoCoC₂ and the evolution of magnetic and structural features in a series of polycrystalline solid solutions HoCo_1-xNi_xC₂ (0<x<1) are investigated by means of X-ray diffraction, magnetization, magnetic susceptibility and specific heat measurements. The crystal structures of all investigated samples refers to the CeNiC₂-type structure (space group Amm2 and Pearson symbol oS8). Non-isoelectronic substitution of Co by Ni causes a non-linear increase of the unit cell volume and especially a non-monotonous variation of the a and c lattice parameters as well as a pronounced reduction of the C-C bond length of carbon dimers. Temperature dependent magnetization and specific heat measurements reveal a crossover from a ferromagnetic for HoCoC₂ with T_C= 10.6(1) K to an antiferromagnetic ground state for HoNiC2 with T_N = 2.78(6) K and a non-monotonous variation of the magnetic ordering temperature with a minimum at intermediate compositions. Crystalline electric field effects of HoCoC₂ and HoNiC₂ are analysed using combined thermodynamic and magnetic susceptibility data. The electrical resistivity of HoNiC₂ displays a distinct anomaly near room temperature which indicates the formation of a charge density wave (CDW) state as earlier reported for several other rare earth
nickel dicarbides.

Rare-earth transition metal carbides, Magnetic properties, Charge density wave

http://dx.doi.org/10.1016/j.jmmm.2017.05.038