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Phonon‐Dislocation Scattering and Low‐Temperature Lattice Thermal Conductivity of Niobium and Tantalum Single Crystals Deformed at Low Temperatures
Author(s) -
Wasserbäch W.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280210
Subject(s) - tantalum , niobium , condensed matter physics , materials science , dislocation , scattering , phonon scattering , thermal conduction , atmospheric temperature range , thermal conductivity , electrical resistivity and conductivity , phonon , deformation (meteorology) , crystallography , optics , composite material , metallurgy , thermodynamics , chemistry , physics , quantum mechanics
The thermal conduction of niobium and tantalum single crystals plastically deformed in steps at low temperatures is measured between 0.3 and 20 K. The dislocation arrangement is studied by X‐ray topography and transmission electron microscopy. The thermal resistivity W d due to the plastic deformation deduced in the temperature range 0.3 K < T < 5 K is found to be proportional to about T −3 after weak deformation. Strong deformation gives rise to a thermal resistivity proportional to T −2 . The results are consistent with the model of scattering of phonons by the static distortion field of dislocations.