Coupled superconducting and magnetic order in CeCoIn5 |
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| Authors: | Kenzelmann M Strässle T Niedermayer C Sigrist M Padmanabhan B Zolliker M Bianchi A D Movshovich R Bauer E D Sarrao J L Thompson J D |
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| Institution: | Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen, Switzerland. |
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| Abstract: | 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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