Conductivity and thermoelectric coefficients of doped SrTiO3 at high temperatures

We developed a theory of electric and thermoelectric conductivity of lightly doped SrTiO3 in the nondegenerate region kBT ≥ EF, assuming that the major source of electron scattering is their interaction with soft transverse optical phonons present due to proximity to ferroelectric transition. We hav...

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Bibliographic Details
Published in:Physical review. B 2021-09, Vol.104 (11), p.1
Main Authors: Nazaryan, Kh G, Feigel'man, M V
Format: Article
Language:English
Subjects:
Electrons
Ferroelectricity
High temperature
Kinetic equations
Mathematical analysis
Parameterization
Phonons
Relaxation time
Seebeck effect
Strontium titanates
Thermoelectricity
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Summary:We developed a theory of electric and thermoelectric conductivity of lightly doped SrTiO3 in the nondegenerate region kBT ≥ EF, assuming that the major source of electron scattering is their interaction with soft transverse optical phonons present due to proximity to ferroelectric transition. We have used the kinetic equation approach within relaxation-time parametrization of the collision integral and we have determined energy-dependent transport relaxation time τ(E) by the iterative procedure. Using electron effective mass m and electron-transverse phonon coupling constant λ as two fitting parameters, we are able to describe quantitatively a large set of the measured temperature dependences of resistivity R ( T ) and Seebeck coefficient S ( T ) for a broad range of electron densities studied experimentally in recent paper by Collignon et al. [Phys. Rev. X 10, 031025 (2020)]. In addition, we calculated Nernst ratio ν = N / B in the linear approximation over weak magnetic field in the same temperature range.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.104.115201