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  Resonant charge relaxation as a likely source of the enhanced thermopower in FeSi

Sun, P., Wei, B., Menzel, D., & Steglich, F. (2014). Resonant charge relaxation as a likely source of the enhanced thermopower in FeSi. Physical Review B, 90(24): 245146, pp. 1-5. doi:10.1103/PhysRevB.90.245146.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-BFD1-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-BFD2-9
Genre: Journal Article

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 Creators:
Sun, Peijie1, Author
Wei, Beipei1, Author
Menzel, Dirk1, Author
Steglich, Frank2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: The enhanced thermopower of the correlated semiconductor FeSi is found to be robust against the sign of the relevant charge carriers. At T approximate to 70 K, the position of both the high-temperature shoulder of the thermopower peak and the nonmagnetic-enhanced paramagnetic crossover, the Nernst coefficient. assumes a large maximum and the Hall mobility mu(H) diminishes to below 1 cm(2)/V s. These cause the dimensionless ratio nu/mu(H) -a measure of the energy dispersion of the charge scattering time tau (epsilon)-to exceed that of classical metals and semiconductors by two orders of magnitude. Concomitantly, the resistivity exhibits a hump and the magnetoresistance changes its sign. Our observations hint at a resonant scattering of the charge carriers at the magnetic crossover, imposing strong constraints on the microscopic interpretation of the robust thermopower enhancement in FeSi.

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Language(s): eng - English
 Dates: 20142014-12-29
 Publication Status: Published in print
 Pages: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 90 (24) Sequence Number: 245146 Start / End Page: 1 - 5 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008