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Magnetic-field-enhanced aniferromagnetism in the noncentrosymmetric heavy-fermion superconductor CePt$$_3$$Si

空間反転対称性の欠如した重い電子系超伝導体CePt$$_3$$Siにおける磁場増強反強磁性

金子 耕士; Stockert, O.*; F${aa}$k, B.*; Raymond, S.*; Skoulatos, M.*; 竹内 徹也*; 大貫 惇睦*

Kaneko, Koji; Stockert, O.*; F${aa}$k, B.*; Raymond, S.*; Skoulatos, M.*; Takeuchi, Tetsuya*; Onuki, Yoshichika*

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 $$B{parallel}c$$ the intensity increases by a factor of 4.6 at a field of 6.6T, which corresponds to more than a doubling of the AFM moment, while the moment increases by only 10% for $$B{parallel}a$$ at 5T. This is in strong contrast to the inelastic response near the antiferromagnetic ordering vector, where no marked field variations are observed for $$B{parallel}c$$ up to 3.8T. The results reveal that the AFM state in CePt$$_3$$Si, which coexists with superconductivity, is distinctly different from other unconventional superconductors.

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パーセンタイル:92.3

分野:Materials Science, Multidisciplinary

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