Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2
2014 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 112, no 10, 106407- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
American Physical Society , 2014. Vol. 112, no 10, 106407- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-106021DOI: 10.1103/PhysRevLett.112.106407ISI: 000332690700006OAI: oai:DiVA.org:liu-106021DiVA: diva2:712944