Novel metallic layered dichalcogenides Pd1-xMx Te2 (M=Ir, Rh) with 0≤x≤1 in a Fermi liquid scenario

LURGO, FLORENCIA E.; CARBONIO, RAÚL E.; RODOLFO D. SÁNCHEZ

Physical Review B

American Physical Society

Lugar: Nueva York; Año: 2024 vol. 109

The synthesis, structural analysis, and physical properties of dichalcogenide families Pd1-x Irx Te2 and Pd1-x Rhx Te2 with 0 <x< 1 are reported. All compositions show layered structures belonging to the P3̄m1 space group at room temperature. These dichalcogenides show ρ ∼ T^2 regime at low temperatures, indicating a strong electron-electron coupling. At high temperatures, the observed regime is ρ ∼ T, associated to electron-phonon coupling. These regimes are characteristic of a Fermi liquid behavior. ρ(T) in both families presents two metals ρ0∝ x(1−x) where x is the with disordered alloys behavior associated with the residual resistivity ratio ρ(300 K) Ir or Rh molar fraction. Pauli paramagnetism is observed in all compositions in total agreement with a Fermi liquid behavior with an important effective mass contribution. Hole-type carriers were determined by Seebeck coefficient measurements, and we determined an entropy configuration using the Mott relation for the diffusive regime and an extra term, which is independent of temperature (δ).