Observation of Two Distinct Superconducting Phases in CeCu 2 Si 2
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- 19 December 2003
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 302 (5653), 2104-2107
- https://doi.org/10.1126/science.1091648
Abstract
We report the presence of two disconnected superconducting domes in the pressure-temperature phase diagram of partially germanium-substituted CeCu 2 Si 2 . The lower density superconducting dome lies on the threshold of antiferromagnetic order, indicating magnetically mediated pairing, whereas the higher density superconducting regime straddles a weakly first-order volume collapse, suggesting a pairing interaction based on spatially extended density fluctuations. Two distinct pairing mechanisms thus appear to operate in the single, wide, superconducting range of stoichiometric CeCu 2 Si 2 , both of which might apply more generally to other classes of correlated electron systems.Keywords
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