Thermoelectrical properties and optical third harmonic generation of Gd-doped PbTe
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Abstract
We performed the temperature measurements of transport and non-linear optical properties, particularly optical third harmonic generation of PbTe and Gd-doped PbTe to elucidate the effect of the rare earth ion doping on behavior of the thermal conductivity and the third-order non-linear optical susceptibility. The feature of Gd-doped PbTe shows the existence of small values of the low temperature resistivities, (\({10^{-6}\Omega\,\hbox{cm}}\)) and a very significant value of mobility \({\mu=1.5^{\ast}10^{6}\hbox{cm}^{2}\hbox{V}^{-1} \hbox{s}^{-1}}\). The thermal conductivity κ decreases with incorporation of the rare earth ion (Gd) in PbTe matrice. The optical third harmonic generation (THG) shows that the great contribution of the phonons observed for PbGdTe compared to the PbTe, enhances the lattice thermal conductivity of network \({(\hbox{k}_{\rm ph})}\).
Keywords
PbTe Seebeck Coefficient Thermoelectric Material Lattice Thermal Conductivity Third Harmonic GenerationNotes
Acknowledgements
We acknowledge helpful discussions with Professor S. Benet (LP2A, University Perpignan, France). S. Charar (Group Etudes Semiconductor GES, University Montpellier II, France) for very useful discussions and suggestions concerning the transport part of the paper and Z. Golacki (Institute of Physics, Warsaw, Poland) for the sample preparations.
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