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Influence of La doping on the properties of molybdenum perovskite Sr 1– x La x MoO 3 (0 ≤ x ≤ 0.2)
Author(s) -
Zhang S. B.,
Sun Y. P.,
Zhao B. C.,
Zhu X. B.,
Song W. H.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541359
Subject(s) - electrical resistivity and conductivity , condensed matter physics , ion , perovskite (structure) , doping , molybdenum , atmospheric temperature range , analytical chemistry (journal) , chemistry , density of states , magnetic susceptibility , materials science , crystallography , physics , inorganic chemistry , thermodynamics , organic chemistry , chromatography , quantum mechanics
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)