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Saturation and pressure effects on the resistivity of titanium and two Ti-Al alloys
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-0462-6206
Umeå University, Faculty of Science and Technology, Department of Physics. Honeywell Aerospace, Phoenix, AZ, 85034, USA.
2018 (English)In: Journal of Physics and Chemistry of Solids, ISSN 0022-3697, E-ISSN 1879-2553, Vol. 122, p. 41-50Article in journal (Refereed) Published
Abstract [en]

The electrical resistivities of a phase titanium and two Ti-Al alloys have been measured as functions of temperature, T, between 4 and 700 K and, in the range 175 to 700 K, as a function of pressure up to 1.2 GPa. All materials showed resistivity saturation effects at the highest temperatures. A “parallel resistivity” saturation model could be fitted to all data with excellent results if Mott-Fermi smearing, expected for a transition metal, was included by adding a term in T3 to the phonon-induced resistivity. However, in the standard saturation model the fitted resistivity parameters were not always realistic. A modified saturation model which partially retained Matthiessen’s rule could be fitted equally well and gave numerically acceptable results for both residual, electron-phonon and saturation resistivities. This new model also fitted the T dependence of the pressure coefficients with a single set of coefficients, each valid for all three materials. Although simple free-electron and Debye models could apparently explain the observed pressure dependence of the impurity and electron-phonon resistivities, a model taking band structure changes with pressure into account showed that the electron-phonon interaction factor of titanium is practically independent of pressure while the plasma frequency has a strong pressure dependence. This model gave reasonable numerical results for the pressure dependence of both the residual, electron-phonon and saturation resistivities and also agreed with experimental data for the superconducting critical temperature Tc under pressure for a titanium.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 122, p. 41-50
Keywords [en]
Electronic transport, Resistivity saturation, High pressure, Electron-phonon coupling, Titanium
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-149618DOI: 10.1016/j.jpcs.2018.05.046ISI: 000440881800007Scopus ID: 2-s2.0-85048544043OAI: oai:DiVA.org:umu-149618DiVA, id: diva2:1223173
Funder
Swedish InstituteAvailable from: 2018-06-25 Created: 2018-06-25 Last updated: 2018-09-13Bibliographically approved

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