Martelli, Valentina ORCID: 0000-0002-8600-5974, Jimenez, Julio Larrea, Continentino, Mucio, Baggio-Saitovitch, Elisa ORCID: 0000-0003-4082-8585 and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2018). Thermal Transport and Phonon Hydrodynamics in Strontium Titanate. Phys. Rev. Lett., 120 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

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 SrTiO3, kappa evolves faster than cubic with temperature below its peak and in a narrow temperature window. Such 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 the presence of dopants. In SrTi1- xNbxO3, a significant reduction in lattice thermal conductivity starts below the temperature at which the average inter-dopant 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) = (h/k(B)T)).

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Martelli, ValentinaUNSPECIFIEDorcid.org/0000-0002-8600-5974UNSPECIFIED
Jimenez, Julio LarreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Continentino, MucioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baggio-Saitovitch, ElisaUNSPECIFIEDorcid.org/0000-0003-4082-8585UNSPECIFIED
Behnia, KamranUNSPECIFIEDorcid.org/0000-0001-8997-5645UNSPECIFIED
URN: urn:nbn:de:hbz:38-192508
DOI: 10.1103/PhysRevLett.120.125901
Journal or Publication Title: Phys. Rev. Lett.
Volume: 120
Number: 12
Date: 2018
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PHASE-TRANSITION; THERMODYNAMIC PROPERTIES; LOW-TEMPERATURE; 2ND SOUND; SRTIO3; CONDUCTIVITY; SCATTERING; SILICON; RESISTIVITY; CRYSTALSMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/19250

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