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Phonon scattering in quasicrystalline i-Al_{72}Pd_{19.5}Mn_{8.5}: A study of the low-temperature thermal conductivity

A. Bilusic·A. Smontara·J. Dolinsek·H. R. Ott·I. R. Fisher·P. C. Canfield
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Abstract

We measured the thermal conductivity of an icosahedral quasicrystal i-Al_{72}Pd_{19.5}Mn_{8.5} in the temperature range between 0.4 K and 300 K. The analysis of the low-temperature results was based on a Debye-type model. The results of the analysis for the two temperature regions of 0.4 K <T<40 K and 0.4 K <T<1 K, are not consistent in the sense that a tunnelling-states contribution to phonon scattering is verified only for 0.4 K <T<1 K. The same fitting procedure indicates that structural defects of the stacking-fault type are an important source of phonon scattering. Their physical presence was cleary identified by a transmission electron microscopy experiment.

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A. Bilusic, A. Smontara, J. Dolinsek, H. R. Ott, I. R. Fisher, P. C. Canfield. 2012-09-21. Phonon scattering in quasicrystalline i-Al_{72}Pd_{19.5}Mn_{8.5}: A study of the low-temperature thermal conductivity. https://doi.org/10.1016/j.jallcom.2006.05.097

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