Journal
SCIENCE
Volume 321, Issue 5896, Pages 1652-1654Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1161818
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Funding
- Swiss National Science Foundation [PP002-102831]
- Swiss National Center of Competence in Research program Materials with Novel Electronic Properties
- Los Alamos Laboratory Directed Research and Development program
- Natural Sciences and Engineering Research Council of Canada (Canada)
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (Quebec)
- Canada Research Chair Foundation
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Strong magnetic fluctuations can provide a coupling mechanism for electrons that leads to unconventional superconductivity. Magnetic order and superconductivity have been found to coexist in a number of magnetically mediated superconductors, but these order parameters generally compete. We report that close to the upper critical field, CeCoIn5 adopts a multicomponent ground state that simultaneously carries cooperating magnetic and superconducting orders. Suppressing superconductivity in a first- order transition at the upper critical field leads to the simultaneous collapse of the magnetic order, showing that superconductivity is necessary for the magnetic order. A symmetry analysis of the coupling between the magnetic order and the superconducting gap function suggests a form of superconductivity that is associated with a nonvanishing momentum.
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