Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn$_5$
| Autor: | Koutroulakis, G., Stewart, Jr., M. D., Mitrović, V. F., Horvatić, M., Berthier, C., Lapertot, G., Flouquet, J. |
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| Rok vydání: | 2009 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.104.087001 |
| Popis: | We present nuclear magnetic resonance (NMR) measurements on the three distinct In sites of CeCoIn$_5$ with magnetic field applied in the [100] direction. We identify the microscopic nature of the long range magnetic order (LRO) stabilized at low temperatures in fields above 10.2 T while still in the superconducting (SC) state. We infer that the ordered moment is oriented along the $\hat c$-axis and map its field evolution. The study of the field dependence of the NMR shift for the different In sites indicates that the LRO likely coexists with a modulated SC phase, possibly that predicted by Fulde, Ferrell, Larkin, and Ovchinnikov. Furthermore, we discern a field region dominated by strong spin fluctuations where static LRO is absent and propose a revised phase diagram. Comment: 4 pages, 4 figures. to appear to Phys. Rev. Lett |
| Databáze: | arXiv |
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