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Low temperature transport properties of TaxN thin films (0.72≤ x ≤ 0.83) (CROSBI ID 167575)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Očko, Miroslav ; Žonja, Sanja ; Nelson G.L. ; Freericks, J.K. ; Yu, Lei ; Newman, N. Low temperature transport properties of TaxN thin films (0.72≤ x ≤ 0.83) // Journal of physics. D, Applied physics, 43 (2010), 44; 445405-1-445405-12. doi: 10.1088/0022-3727/43/44/445405

Podaci o odgovornosti

Očko, Miroslav ; Žonja, Sanja ; Nelson G.L. ; Freericks, J.K. ; Yu, Lei ; Newman, N.

engleski

Low temperature transport properties of TaxN thin films (0.72≤ x ≤ 0.83)

We report on low temperature (4-320 K) transport properties of TaxN thin films deposited on an amorphous SiO2 substrate. In this work, TaxN thin films were restricted to a narrow range of x: 0.72 ≤ x ≤ 0.83 yet show considerable and nonmonotonic variation of their transport properties with Ta concentration. This behaviour, is consistent with a local minimum in the density of electronic states at the Fermi level, as calculated for the rock salt intermetallic Ta4N5, and a rigid band model for describing the transport. The temperature dependence of the resistivity is best fit to the unusual form exp(-T/T0). Interestingly enough, the fit parameter T0 correlates well with the temperature of the maximum of the corresponding thermopower. Both of these characteristics, the fit and the correlation with the thermopower, are consistent with the Jonson-Mahan many-body formalism for charge and thermal transport when one has a nontrivial temperature dependence of the chemical potential. At the lowest temperatures measured, we have also found that the resistivity and thermopower show signatures of electron-electron interactions. We discuss also our results in the light of some theories usually used for describing transport of thin films and to other experimental investigations that have been performed on TaxN.

TaxN thin films; resistivity; thermopower

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Podaci o izdanju

43 (44)

2010.

445405-1-445405-12

objavljeno

0022-3727

10.1088/0022-3727/43/44/445405

Povezanost rada

Fizika, Elektrotehnika

Poveznice
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