Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu<sub>2</sub>Si<sub>2</sub> - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2014

Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2

Résumé

We show that the heavy-fermion compound CeCu2Si2 undergoes a transition between two regimes dominated by different crystal-field states. At low pressure P and low temperature T the Ce 4f electron resides in the atomic crystal-field ground state, while at high P or T, the electron occupancy and spectral weight is transferred to an excited crystal-field level that hybridizes more strongly with itinerant states. These findings result from first-principles dynamical-mean-field-theory calculations. Wepredict experimental signatures of this orbital transition in X-ray spectroscopy. The corresponding fluctuations may be responsible for the second high-pressure superconducting dome observed in this and similar materials.
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Dates et versions

hal-02363993 , version 1 (08-01-2025)

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L. V. Pourovskii, P. Hansmann, Michel Ferrero, A. Georges. Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2. Physical Review Letters, 2014, 112 (10), pp.106407. ⟨10.1103/PhysRevLett.112.106407⟩. ⟨hal-02363993⟩
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