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The effect of magnetic field on the static and dynamic spin correlations inthe non-centrosymmetric heavy-fermion superconductor CePt$_3$Si wasinvestigated by neutron scattering. The application of a magnetic field Bincreases the antiferromagnetic (AFM) peak intensity. This increase dependsstrongly on the field direction: for B${\parallel}$[0 0 1] the intensityincreases by a factor of 4.6 at a field of 6.6 T, which corresponds to morethan a doubling of the AFM moment, while the moment increases by only 10 % forB${\parallel}$[1 0 0] at 5 T. This is in strong contrast to the inelasticresponse near the antiferromagnetic ordering vector, where no marked fieldvariations are observed for B${\parallel}$[0 0 1] up to 3.8 T. The resultsreveal that the AFM state in CePt$_3$Si, which coexists with superconductivity,is distinctly different from other unconventional superconductors.

Magnetic-field enhanced aniferromagnetism in non-centrosymmetric heavy-fermion superconductor CePt$_3$Si