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Title: Interpretation of thermal conductivity in LaFeAsO at low temperatures

Thermal conductivity κ(T) of LaFeAsO is theoretically investigated below the spin density wave (SDW) anomaly. The lattice contribution to the thermal conductivity (κ{sub ph}) 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)
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics, Govt. Holkar Science college, A. B. Road, Indore-452001 (India)
  2. Department of Biological Engineering, Utah State University, Logan, UT-84322 U.S.A (United States)
  3. Department of Physics, National Defence Academy, Khadakwasla, Pune-411 0231 India (India)
Publication Date:
OSTI Identifier:
22490454
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 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; APPROXIMATIONS; CHARGE CARRIERS; DENSITY; GRAIN BOUNDARIES; HEAT TRANSFER; PHONONS; RELAXATION TIME; SCATTERING; SPIN; SPIN WAVES; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY