  Unconventional superconductivity in many materials is believed to be mediated
by magnetic fluctuations. It is an open question how magnetic order can emerge
from a superconducting condensate and how it competes with the magnetic spin
resonance in unconventional superconductors. Here we study a model d-wave
superconductor that develops spin-density wave order, and find that the spin
resonance is unaffected by the onset of static magnetic order. This result
suggests a scenario, in which the resonance in Nd0.05Ce0.95CoIn5 is a
longitudinal mode with fluctuating moments along the ordered magnetic moments.

Strongly Correlated Electrons