Influence of La doping on the properties of molybdenum perovskite Sr 1– x La x MoO 3 (0 ≤ x ≤ 0.2)

The effects of La‐doping on the structural, magnetic, electrical transport and specific‐heat properties in 4d perovskites Sr 1 –x La x MoO 3 (0 ≤ x ≤ 0.2) have been investigated. The substitution of Sr ions by La ions does not change the space group of the samples, but increases the lattice parameter a (Å). The resistivity ρ and magnetic susceptibility χ decrease monotonously with the increase of x , while the electronic specific heat coefficient γ e increases. The resistivity of all samples shows a T 2 dependence in the low‐temperature region of 2 K < T < 125 K and a T dependence in the high‐temperature range of 130 K < T < 350 K, related to the electron–electron (e–e) and electron–phonon (e–ph) scattering, respectively. The specific‐heat data agrees with the classical Dulong–Petit phonon specific heat, C cl = 3 k B rN A = 124.7 J/mol K at high temperatures and C p ( T )/ T = γ e + β p T 2 at low temperatures. These behaviors can be explained according to the decrease of the density of states (DOS) at the Fermi energy level ( E F ), N ( E F ). (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)