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The implications of the spin exciton mechanism are exposed in the context ofa Spin Density Wave (SDW) instability occurring inside the superconductingphase of a layered heavy electron compound. In this model a magnetic fieldserves as a tuning parameter bringing the system to the point where thetransverse spin correlations are enhanced due to dx2 -y2 -wavesuperconductivity and induces an instability to a phase with coexistingsuperconductivity and SDW order. The model considers electrons in a crystalwith antiferromagnetic interactions and provides restrictions on the Fermisurface characteristics and on the ordering wave-vector (that can becommensurate or incommensurate close to commensuration). The applications ofthe model are addressed to the low-temperature/high-magnetic-field phase ofCeCoIn5 [M. Kenzelmann et al., Science 321, 1652 (2008), Phys. Rev. Lett. 104,127001 (2010)].

Field-Induced Spin-Exciton Condensation in dx2-y2-wave Superconducting CeCoIn5