Novel metallic layered dichalcogenides Pd 1 − x M x Te 2 ( M = Ir , Rh ) with 0 ≤ x ≤ 1 in a Fermi liquid scenario

Abstract

The synthesis, structural analysis, and physical properties of dichalcogenide families Pd1−xIrxTe2 and Pd1−xRhxTe2with 0≤x≤1are reported. All compositions show layered structures belonging to the P¯3m1space group at room temperature. These dichalcogenides show ρ∼T2 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 with disordered alloys behavior associated with the residual resistivity ratio ρ0ρ(300K)∝x(1−x) where x is the 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).