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Phonon and electron contributions to the thermal conductivity of VNx epitaxial layers
University of Illinois, USA.
University of Illinois, USA.
University of Illinois, USA.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Ruhr University of Bochum, Germany.ORCID iD: 0000-0002-1379-6656
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2017 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 1, no 6, article id 065002Article in journal (Refereed) Published
Abstract [en]

Thermal conductivities of VNx/MgO(001) (0.76 amp;lt;= x amp;lt;= 1.00) epitaxial layers, grown by reactive magnetron sputter deposition, are measured in the temperature range 300 amp;lt; T amp;lt; 1000 K using time-domain thermore-flectance (TDTR). Data for the total thermal conductivity are compared to the electronic contribution to the thermal conductivity calculated from the measured electrical conductivity, the Wiedemann-Franz law, and an estimate of the temperature dependence of the Lorenz number L(T). The total thermal conductivity is dominated by electron contribution and varies between 13 W m(-1) K-1 at x = 0.76 and 20 W m(-1) K-1 at x = 1.00 for T = 300 K and between 25 and 35 W m(-1) K-1 for T = 1000 K. The lattice thermal conductivity vs x ranges from 5 to 7 W m(-1) K-1 at 300 K and decreases by 20% at 500 K. The low magnitude and weak temperature dependence of the lattice thermal conductivity are attributed to strong electron-phonon coupling in VN.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 1, no 6, article id 065002
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-143732DOI: 10.1103/PhysRevMaterials.1.065002ISI: 000416597100002OAI: oai:DiVA.org:liu-143732DiVA, id: diva2:1166718
Note

Funding Agencies|Swedish Research Council (VR) [2009-00971, 2013-4018, 2014-5790]; Swedish Government Strategic Research Area Grant in Materials Science (SFO Mat-LiU) on Advanced Functional Materials; Olle Engkvist Foundation

Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2019-06-28

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CiteExportLink to record
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