Thermal Transport and Phonon Hydrodynamics in Strontium Titanate
| Autor: | V. Martelli, Elisa Baggio-Saitovitch, Mucio A. Continentino, Julio Larrea Jiménez, Kamran Behnia |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Phonon General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Thermal diffusivity 01 natural sciences Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons chemistry.chemical_compound Condensed Matter::Materials Science Thermal conductivity 0103 physical sciences Thermal de Broglie wavelength 010306 general physics Condensed Matter - Materials Science Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Scattering Condensed Matter - Superconductivity Doping Materials Science (cond-mat.mtrl-sci) Atmospheric temperature range 021001 nanoscience & nanotechnology chemistry Strontium titanate 0210 nano-technology |
| Zdroj: | Physical review letters. 120(12) |
| ISSN: | 1079-7114 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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