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Effect of magnetic field on magnetic excitation in heavy-fermion superconductors probed via neutron scattering

Kaneko, Koji   ; Raymond, S.*; Hiess, A.*; F${aa}$k, B.*; Steffens, P.*; Lapertot, G.*; Settai, Rikio*; Onuki, Yoshichika

An interplay between magnetism and superconductivity is one of the main research subjects in the field of strongly correlated electron systems. Magnetic excitation of heavy-fermion superconductor CeCoIn$$_{5}$$ (CCI5), which has the highest $$T_{rm sc}$$ of 2.3 K among the Ce-based heavy-fermion superconductors, exhibits distinct change; a quasielastic magnetic response above $$T_{rm sc}$$ turns into spin resonance below $$T_{rm sc}$$. Contrasting behaviour was obtained in non-centrosymmetric heavy-fermion superconductor CePt$$_3$$Si (CP3S) with $$T_{rm N}$$ = 2.2 K and $$T_{rm sc}{sim}$$ 0.5 K. In CP3S, identical magnetic excitation spectra have been observed below and above $$T_{rm sc}$$. Instead, an external magnetic field induces a drastic enhancement of the antiferromagnetic moment. We will show our latest results on neutron scattering study under magnetic field to get insights into the nature of resonance in CCI5, and the origin of the antiferromagnetic moment enhancement in CP3S.



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