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Giant Overlap between the Magnetic and Superconducting Phases of CeAu2Si2 under Pressure
University of Geneva, Switzerland.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology. Ecole Polytech, France.
University of Geneva, Switzerland.
University of Grenoble Alpes, France; CEA, France.
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2014 (English)In: Physical Review X, ISSN 2160-3308, Vol. 4, no 3, 031055- p.Article in journal (Refereed) Published
Abstract [en]

High pressure provides a powerful means for exploring unconventional superconductivity which appears mostly on the border of magnetism. Here, we report the discovery of pressure-induced heavy-fermion superconductivity up to 2.5 K in the antiferromanget CeAu2Si2 (T-N approximate to 10 K). Remarkably, the magnetic and superconducting phases are found to overlap across an unprecedentedly wide pressure interval from 11.8 to 22.3 GPa. Moreover, both the bulk T-c and T-M are strongly enhanced when increasing the pressure from 16.7 to 20.2 GPa. T-c reaches a maximum at a pressure slightly below p(c) approximate to 22.5 GPa, at which magnetic order disappears. Furthermore, the scaling behavior of the resistivity provides evidence for a continuous delocalization of the Ce 4f electrons associated with a critical end point lying just above p(c). We show that the maximum T-c of CeAu2Si2 actually occurs at almost the same unit-cell volume as that of CeCu2Si2 and CeCu2Ge2, and when the Kondo and crystal-field splitting energies become comparable. Dynamical mean-filed theory calculations suggest that the peculiar behavior in pressurized CeAu2Si2 might be related to its Ce-4f orbital occupancy. Our results not only provide a unique example of the interplay between superconductivity and magnetism, but also underline the role of orbital physics in understanding Ce-based heavy-fermion systems.

Place, publisher, year, edition, pages
American Physical Society , 2014. Vol. 4, no 3, 031055- p.
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-111752DOI: 10.1103/PhysRevX.4.031055ISI: 000342665200002OAI: diva2:759776

Funding Agencies|Swiss National Science Foundation [200020-137519]; European Research Council [ERC-319286 QMAC]

Available from: 2014-10-31 Created: 2014-10-31 Last updated: 2014-11-04

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