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Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

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Sun,  P.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1EBC-B
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.