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  Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Sun, P., & Steglich, F. (2013). Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions. Physical Review Letters, 110(21): 216408, pp. 216408-1-216408-5. doi:10.1103/PhysRevLett.110.216408.

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Sun, P.1, Autor           
Steglich, F.2, Autor           
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Zusammenfassung: A distinctly temperature-dependent Nernst coefficient, nu, which is strongly enhanced over that of LaCu2Si2, is observed between T = 2 and 300 K for CeCu2Si2 and Ce0.8La0.2Cu2Si2. The enhanced nu(T) is determined by the asymmetry of the on-site Kondo (conduction electron -4f electron) scattering rate. Taking into account the measured Hall mobility, mu(H), the highly unusual thermopower, S, of these systems can be semiquantitatively described by S(T) = -nu(T)/mu(H)(T), which explicitly demonstrates that the thermopower originates from the local Kondo scattering process over a wide temperature range from far above to well below the coherence temperature (approximate to 20 K for CeCu2Si2). Our results suggest that the Nernst effect can act as a proper probe of local charge-carrier scattering. This promises to impact on exploring the unconventional enhancement of the thermopower in correlated materials suited for potential applications.

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Sprache(n): eng - English
 Datum: 2013-05-24
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: eDoc: 668726
ISI: 000319394600006
DOI: 10.1103/PhysRevLett.110.216408
 Art des Abschluß: -

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Titel: Physical Review Letters
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 110 (21) Artikelnummer: 216408 Start- / Endseite: 216408-1 - 216408-5 Identifikator: ISSN: 0031-9007