Analysis of Thermal Conductivity of LaFeAsO at Low Temperature

Autor:	K.K. Choudhary, Netram Kaurav
Rok vydání:	2014
Předmět:	Thermal conductivity Materials science Phonon scattering Condensed matter physics Scattering Phonon Condensed Matter::Superconductivity Heat transfer General Engineering Spin density wave Condensed Matter::Strongly Correlated Electrons Grain boundary Thermal conduction
Zdroj:	Advanced Materials Research. 1047:1-3
ISSN:	1662-8985
DOI:	10.4028/www.scientific.net/amr.1047.1
Popis:	Thermal conductivity κ (T) of LaFeAsO is theoretically investigated below the spin density wave (SDW) anomaly. The lattice contribution to the thermal conductivity (κph) is discussed within the Debye-type relaxation rate approximation in terms of the acoustic phonon frequency and relaxation time below 150 K. The theory is formulated when heat transfer is limited by the scattering of phonons from defects, grain boundaries, charge carriers, and phonons. The lattice thermal conductivity dominates in LaFeAsO and is an artifact of strong phonon-impurity and-phonon scattering mechanism. Our result indicates that the maximum contribution comes from phonon scatters and various thermal scattering mechanisms provide a reasonable explanation for maximum appeared in κ (T).
Databáze:	OpenAIRE
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