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.
@article{arxiv.1705.01255,
title = {Spin Resonance and Magnetic Order in an Unconventional Superconductor},
author = {D. G. Mazzone and S. Raymond and J. L. Gavilano and P. Steffens and A. Schneidewind and G. Lapertot and M. Kenzelmann},
journal= {arXiv preprint arXiv:1705.01255},
year = {2017}
}