Evolution of the spin resonance in CeCoIn5 under magnetic field
Abstract
The evolution of the magnetic excitation spectrum of the unconventional superconductor CeCoIn5 was studied by inelastic neutron scattering as a function of magnetic field applied in the [1, -1, 0] direction. The spin resonance characteristic of the superconducting states was observed up to about Hc2/2 : it is still centered at (1/2, 1/2, 1/2) when the magnetic field increases while its characteristic energy decreases and its lineshape substantially broadens.
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