Magnetic field dependence of the resonance peak of the unconventional superconductor CeCoIn5
The spin resonance is an ubiquitous magnetic excitation appearing in many unconventional superconductors. Heavy fermion systems are particularly well suited to study the spin resonance under magnetic field since large effects can be observed due to the intrinsic low energy scales. In a previous experiment, we establish by using polarized inelastic neutron scattering under horizontal magnetic field that the lineshape of the resonance mode of CeCoIn5 is polarization dependent. By separating the signal into chiral and non chiral contributions, we interpret our measurements as an evidence for the spin resonance being a degenerate mode with three fluctuations channels. This was established by performing measurements at 2 T ; we now want to study the field dependence of the different split branches especially owing to the fact that we found coincidence in energy between the lower mode of the Zeeman split peak and the longitudinal mode.
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RAYMOND Stephane; HIESS Arno; KANEKO Koji; LAPERTOT Gerard and STEFFENS Paul. (2013). Magnetic field dependence of the resonance peak of the unconventional superconductor CeCoIn5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1252
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