Study of the spin resonance in Nd0.05Ce0.95CoIn5
Nd0.05Ce0.95CoIn5 is a novel heavy-fermion superconductor where a spin-density wave can be tuned inside a superconducting phase by means of an external magnetic field. Our neutron diffraction results show that a low-field spin-density wave (SDW) is gradually suppressed with increasing fields at about 8 T. At higher fields, we observed a second magnetic phase with nearly identical propagation vector and same magnetic structure. The high-field SDW is coupled to superconductivity and exhibits similar properties as the Q-phase in CeCoIn5. The two phases are separated by a quantum critical point (QCP) raising the open question of its driving mechanism. One possibility involves the fluctuations of quasiparticle excitations. Theoretically it was predicted in the parent compound that a superconducting spin exciton condensates at the QCP and couples superconductivity and magnetism. We aim at searching for this spin resonance and study its temperature dependence at zero field with focus on its behaviour when entering the SDW phase. Because of the hypersensitivity of magnetism on small differences in the Nd concentration the experiment will be carried out one single crystalline sample only.
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MAZZONE Daniel Gabriel; GAVILANO Jorge; KENZELMANN Michel; RAYMOND Stephane and STEFFENS Paul. (2016). Study of the spin resonance in Nd0.05Ce0.95CoIn5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-470
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