Suppression of f-Electron Itinerancy in CeRu2Si2 by a Strong Magnetic Field
| Autor: | Matsuda, Y. H., Nakamura, T., Her, J. L., Michimura, S., Inami, T., Kindo, K., Ebihara, T. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.86.041109 |
| Popis: | The valence state of Ce in a canonical heavy fermion compound CeRu2Si2 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 CeRu2Si2 was suppressed by a strong magnetic field. The suppression was gradual and showed characteristic magnetic field dependence, which reflects the metamagnetism around Hm \sim 8 T. The itinerant character persisted, even at 40 T (\sim 5Hm), suggesting that the Kondo bound state is continuously broken by magnetic fields and that it should completely collapse at fields exceeding 200 T. Comment: 5 pages, 4 figures, accepted for publication as a Rapid Communication in Physical Review B |
| Databáze: | arXiv |
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