تقرير
Thermal transport and phonon hydrodynamics in strontium titanate
| العنوان: | Thermal transport and phonon hydrodynamics in strontium titanate |
|---|---|
| المؤلفون: | Martelli, Valentina, Jiménez, Julio Larrea, Continentino, Mucio, Baggio-Saitovitch, Elisa, Behnia, Kamran |
| المصدر: | Phys. Rev. Lett. 120, 125901 (2018) |
| سنة النشر: | 2018 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity |
| الوصف: | We present a study of thermal conductivity, $\kappa$, in undoped and doped strontium titanate in a wide temperature range (2-400 K) and detecting different regimes of heat flow. In undoped SrTiO$_{3}$, $\kappa$ evolves faster than cubic with temperature below its peak and in a narrow temperature window. Such a behavior, previously observed in a handful of solids, has been attributed to a Poiseuille flow of phonons, expected to arise when momentum-conserving scattering events outweigh momentum-degrading ones. The effect disappears in presence of dopants. In SrTi$_{1-x}$Nb$_{x}$O$_{3}$, a significant reduction in lattice thermal conductivity starts below the temperature at which the average interdopant distance and the thermal wavelength of acoustic phonons become comparable. In the high-temperature regime, thermal diffusivity becomes proportional to the inverse of temperature, with a prefactor set by sound velocity and Planckian time ($\tau_{p}=\frac{\hbar}{k_{B}T}$). Comment: 5 pages including 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.120.125901 |
| URL الوصول: | http://arxiv.org/abs/1802.05868 |
| رقم الأكسشن: | edsarx.1802.05868 |
| قاعدة البيانات: | arXiv |
كن أول من يترك تعليقا!