Abstract
Thermal conductivity κ(T) of a high-quality polycrystalline TbFeAsO0.85 sample is theoretically investigated. 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 superconducting transition temperature (Tc = 42.5 K). The theory is formulated when heat transfer is limited by the scattering of phonons from defects, grain boundaries, charge carriers, and phonons. The κph dominates in TbFeAsO0.85 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).
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