Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn$_5$

Details Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn$_5$ Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn$_5$

2009-12-17

arxiv.org/abs/0912.3548v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures. to appear to Phys. Rev. Lett

Scientific paper

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.

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