Thermal conductivity of ferromagnetic metallic La0.95Ag0.05MnO3 manganites: role of carrier, spin waves and lattice–impurity scattering. Issue 2 (22nd January 2016)

• Record Type: Journal Article
• Authors: Varshney, Dinesh; Choudhary, Dinesh; Varshney, Meenu; Singh, Namita
• Is Part Of: Molecular simulation. Volume 42:Issue 2(2016)
• Page Start: 110
• Page End: 121
• Publication Date: 2016-01-22
• Subjects: manganites -- phonon–phonon interactions -- spin waves; Molecular dynamics -- Computer simulation -- Periodicals; Statistical mechanics -- Computer simulation -- Periodicals; 539.6
• DOI: 10.1080/08927022.2015.1012643
• Languages: English
• ISSNs: 0892-7022

Abstract

Abstract : The lattice contribution to the thermal conductivity (κph ) of La0.95 Ag0.05 MnO3 manganites is theoretically analysed within the framework of Kubo model. The theory is formulated when thermal conduction is limited by the scattering of phonons from defects, grain boundaries, charge carriers, spin waves and phonons. The lattice thermal conductivity dominates in Ag-doped manganites and is artefact of strong phonon–impurity and phonon–phonon scattering mechanism in the ferromagnetic metallic state. The electronic contribution to the thermal conductivity (κe ) is estimated following the Wiedemann–Franz law. Another important contribution in the metallic phase should come from spin waves (κm ). It is noticed that κm increases with a T 2 dependence on the temperature. The behaviour of the thermal conductivity in manganites is determined by competition among the several operating scattering mechanisms for the heat carriers and a balance between electron, magnon and phonon contributions.