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Neutron scattering study on high-quality single crystals of non-centrosymmetric heavy-fermion superconductor CePt$$_{3}$$Si

Kaneko, Koji  ; Stockert, O.*; Skoulatos, M.*; Schneidewind, A.*; Takeuchi, Tetsuya*; Matsuda, Tatsuma; Haga, Yoshinori ; Settai, Rikio*; Onuki, Yoshichika; Metoki, Naoto  

The discovery of heavy-fermion superconductivity in non-centrosymmetric compound CePt$$_3$$Si, and subsequent findings of Ce$$TX_3$$ (T: transition metal, X: Si, Ge) bring a new essence in the condensed matter physics, since a novel type of superconducting properties is expected to come out. In CePt$$_3$$Si, the compound shows an antiferromagnetic (AFM) order at $$T_{rm N }$$=2.2 K and enters into a heavy-fermion superconducting state below $$T_{rm SC}{sim}$$ 0.5 K. Through neutron scattering experiments under external magnetic field, we identified anomalous field response in CePt$$_3$$Si in the AFM state; AFM intensity showed enormous enhancement with increasing an applied field. The intensity kept increasing up to 7 T with the kink at around the additional phase boundary. These features suggest that the magnetic order in CePt$$_3$$Si is not a simple AFM one, and imply that large fraction of magnetic response could be still missing in this compound.

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Category:Physics, Multidisciplinary

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