Suppression of f-electron itinerancy in CeRu 2Si 2 by a strong magnetic field

Y. H. Matsuda*, T. Nakamura, J. L. Her, S. Michimura, T. Inami, K. Kindo, T. Ebihara

*Corresponding author for this work

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The valence state of Ce in a canonical heavy fermion compound CeRu 2Si 2 has been investigated by synchrotron x-ray absorption spectroscopy at 1.8 K in high magnetic fields of up to 40 T. The valence was slightly larger than for the pure trivalent state (Ce3 +:f1), as expected in heavy fermion compounds, and it decreased toward the trivalent state as the magnetic field was increased. The field-induced valence reduction indicates that the itinerant character of the 4f electrons in CeRu 2Si 2 was suppressed by a strong magnetic field. The suppression was gradual and showed a characteristic magnetic field dependence, which reflects the metamagnetism around H m∼8 T. The itinerant character persisted, even at 40 T (∼5H m), suggesting that the Kondo bound state is continuously broken by magnetic fields and that it may completely collapse at fields exceeding 200 T.

Original languageEnglish
Article number041109
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
StatePublished - 27 07 2012


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