Repozytorium publikacji - Politechnika Gdańska

A series of polycrystalline samples of Y3 M (M  =  Co, Ni, Rh, Pd, Ir, Pt), intermetallic binary compounds were synthesized by the arc-melting method. Powder x-ray diffraction (pXRD) confirmed the orthorhombic cementite-type crystal structure and allowed for the estimation of the lattice parameters. Physical properties were investigated by means of electrical resistivity and heat capacity measurements between 1.9 K and 300 K. All tested compounds show metallic-like behaviour with RRR values ranging from 1.3 to 8.3, and power-law $\rho \propto {{T}^{n}}$ temperature dependence of resistivity was observed, with $1.6\leqslant n\leqslant 2.2$ . No superconductivity was detected above 1.9 K. The Debye temperature, estimated from the low temperature heat capacity fit, ranged from 180 K (Y3Pt) to 222 K (Y3Co). The highest value of the Sommerfeld coefficient γ was found for Y3Pd (19.5 mJ mol−1 K−2). The pXRD pattern of Y3Rh indicated the presence of Y5Rh2, a previously unreported Pd5B2-type phase, whose unit cell parameters were refined using the LeBail method. Density functional theory calculations were performed and theoretical results revealed strong enhancement of the measured electronic specific heat, which was 30%–100% larger than computed. Quadratic temperature dependence of resistivity and enhanced electronic specific heat indicated a Fermi-liquid behavior of electrons in these materials.

Autorzy

• Judyta Strychalska-Nowak link otwiera się w nowej karcie ,
• Bartłomiej Wiendlocha,
• Katarzyna Hołowacz link otwiera się w nowej karcie ,
• Paula Reczek link otwiera się w nowej karcie ,
• Mateusz Podgórski link otwiera się w nowej karcie ,
• dr inż. Michał Jerzy Winiarski link otwiera się w nowej karcie ,
• prof. dr hab. inż. Tomasz Klimczuk link otwiera się w nowej karcie