Magnetic properties of HoCoC2, HoNiC2 and their solid solutions
Journal of Magnetism and Magnetic Materials(2017)
摘要
Magnetic properties of single crystalline HoCoC2 and the evolution of magnetic and structural features in a series of polycrystalline solid solutions HoCo1−xNixC2 (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 TC=10.6(1)K to an antiferromagnetic ground state for HoNiC2 with TN=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.
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关键词
Rare-earth transition metal carbides,Magnetic properties,Crystalline electric field,Charge density wave,Heat capacity
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