Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2

Pourovskii LV, Hansmann P, Ferrero M, Georges A (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Physical Review Letters American Physical Society

Book Volume: 112

Journal Issue: 10

DOI: 10.1103/PhysRevLett.112.106407

Abstract

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. We predict 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.

Authors with CRIS profile

Philipp Hansmann Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien

Involved external institutions

École Polytechnique - Université Paris-Saclay FR France (FR)

How to cite

APA:

Pourovskii, L.V., Hansmann, P., Ferrero, M., & Georges, A. (2014). Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2. Physical Review Letters, 112(10). https://dx.doi.org/10.1103/PhysRevLett.112.106407

MLA:

Pourovskii, L. V., et al. "Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2." Physical Review Letters 112.10 (2014).

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