Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Martelli, Valentina UNSPECIFIED orcid.org/0000-0002-8600-5974 UNSPECIFIED Jimenez, Julio Larrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Continentino, Mucio UNSPECIFIED UNSPECIFIED UNSPECIFIED Baggio-Saitovitch, Elisa UNSPECIFIED orcid.org/0000-0003-4082-8585 UNSPECIFIED Behnia, Kamran UNSPECIFIED orcid.org/0000-0001-8997-5645 UNSPECIFIED
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:	Keywords Language PHASE-TRANSITION; THERMODYNAMIC PROPERTIES; LOW-TEMPERATURE; 2ND SOUND; SRTIO3; CONDUCTIVITY; SCATTERING; SILICON; RESISTIVITY; CRYSTALS Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19250