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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EBC-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EBD-9
Genre: Journal Article

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Sun, P.1, Author              
Steglich, F.2, Author              
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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 Abstract: 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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Language(s): eng - English
 Dates: 2013-05-24
 Publication Status: Published in print
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Title: Physical Review Letters
Source Genre: Journal
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Pages: - Volume / Issue: 110 (21) Sequence Number: 216408 Start / End Page: 216408-1 - 216408-5 Identifier: ISSN: 0031-9007