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Dinesh Varshney,Neha Dodiya 한국물리학회 2013 Current Applied Physics Vol.13 No.7
The electrical resistivity behaviour of alkali metal (Na, K, Rb) substitutions at La site in LaxAyMnwO3(A = Na, K, Rb) manganites is studied caused by electronephonon, electroneelectron and electron emagnon scattering. Substitutions affect average mass and ionic radii of A-site and hence resulting lattice and optical phonon softening. Estimated resistivity compared with reported metallic resistivity,accordingly rdiff. = [rexp - {r0 + reeph (=rac + rop)}], infers electroneelectron and electronemagnon dependence over most of the temperature range. Electronephonon contribution indicates that alkali metal K doping provoked larger lattice distortion, while electroneelectron interaction is more dominating process for Na and Rb doped compound favouring motion of excess charge carrier. Semiconducting nature is discussed with variable range hopping and small polaron conduction model. The change in activation energies and the density of states at the Fermi-level is consistently explained by cationic disorder and Mn valence.