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

Abstract

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

5 pages, 4 figures, accepted for publication in Phys. Rev. B

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Cited by in corpus (1)

• Magnetic structure of the noncentrosymmetric heavy-fermion superconductor CePt3Si