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Site dependence of the Kondo scale in CePd1-xRhx due to Pd-Rh disorder

MPG-Autoren
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Stockert,  U.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hartmann,  S.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Deppe,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Caroca-Canales,  N.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, 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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Zitation

Stockert, U., Hartmann, S., Deppe, M., Caroca-Canales, N., Sereni, J. G., Geibel, C., et al. (2015). Site dependence of the Kondo scale in CePd1-xRhx due to Pd-Rh disorder. Physical Review B, 92(5): 054415, pp. 1-7. doi:10.1103/PhysRevB.92.054415.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0028-4E38-F
Zusammenfassung
We present measurements of the thermopower S(T) on CePd1-xRhx between 2 K and 300 K. For low Rh content, the system behaves as a ferromagnetic Kondo system with a Curie temperature T-C of about 6 K, a Kondo scale smaller than T-C, and an overall crystal electric field splitting of 210 K. As the Rh content increases T-C is suppressed, while the average Kondo scale gets larger. Simultaneously, the presence of different Ce environments leads to a broad distribution of local Kondo scales ranging from very small values to above 50 K. As a consequence, large thermopower values are observed over an extended temperature range. Close to the critical concentration we find power-law dependencies of S/T vs T down to 2 K. For a Rh content of x = 0.95 we may show explicitly that the thermopower contains contributions from Ce sites with different local energy scales.