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Title: Metallic and semiconducting resistivity behavior of La{sub 1−x}K{sub x}MnO{sub 3} manganites

The electrical conduction in both metallic and semiconducting phase of La{sub 1−x}K{sub x}MnO{sub 3} (x = 0.05, 0.1, 0.15) is investigated. The phonon frequencies are estimated from the ab initio theory with calibrated Hamiltonian for the atomic interaction between a pair such as Mn–O and La/K–O including van der Walls interaction. The classical electron–phonon model of resistivity, i.e., the Bloch–Gruneisen (BG) model consistently retraces the reported metallic resistivity behavior. The paramagnetic semiconducting nature is discussed with thermal activation, small polaron conduction and Mott’s variable range hopping model. The comparison of experimental data appears favorable with the present analysis.
Authors:
; ;  [1]
  1. School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore-452001 (India)
Publication Date:
OSTI Identifier:
22269293
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HAMILTONIANS; INTERACTIONS; PARAMAGNETISM; SEMICONDUCTOR MATERIALS