Abstract
Measurements of the low temperature (T<3K) thermal conductivity of KH2PO2 (KDP) indicate that scattering from domain walls has a large effect on phonon transport. KDP has a ferroelectric phase transition from tetragonal to orthorhombic structure at Tc=123K. Below Tc, domains of opposite electric polarization and crystal orientation form unless the sample is cooled in an electric field. Thermal conductivity measured along the [100] (tetragonal) axis shows a 30% drop when domain walls are present, which is independent of sample size and temperature. This independence could be due to polarization dependent scattering at the domain boundaries. To investigate this possibility, we make use of ballistic phonon imaging techniques. [1]
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© 1993 Springer-Verlag Berlin Heidelberg
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Weilert, M.A., Msall, M.E., Anderson, A.C., Wolfe, J.P. (1993). Specular Phonon Scattering from Ferroelectric Domain Walls in KDP. In: Meissner, M., Pohl, R.O. (eds) Phonon Scattering in Condensed Matter VII. Springer Series in Solid-State Sciences, vol 112. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84888-9_17
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DOI: https://doi.org/10.1007/978-3-642-84888-9_17
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