J. Phys. Soc. Jpn. 75S (2006) pp. 177-179  |Previous Article| |Next Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

Coexistence of Antiferromagnetism and Heavy-Fermion Superconductivity in CePt₃Si Studied by Neutron Scattering

Koji Kaneko¹, Naoto Metoki^1,2, Nicholas Bernhoeft³, Tatsuma D. Matsuda¹, Yoshinori Haga^1,2, Takashi Yasuda⁴, Tetsuya Takeuchi⁵, Rikio Settai⁴ and Yoshichika Ōnuki^1,4

Neutron scattering experiments were carried out for a non-centrosymmetric heavy-fermion superconductor CePt₃Si in order to understand the novel superconducting state and magnetism. Antiferromagnetic reflections with q=(0 0 1/2) clearly persist below T_sc. No significant anomaly has been found in either the Bragg profile or intensity on passing through T_sc within our experimental accuracy. These results indicate a microscopic coexistence of antiferromagnetism and heavy-fermion superconductivity in CePt₃Si. Under magnetic fields, T_N is almost constant up to 5 T for fields H∥[0 0 1]. Note that the antiferromagnetic intensity starts increasing around 2 T at 1.51 K below T_N, indicating the enhancement of antiferromagnetic moment of Ce by applying fields. The observed inflection field and the field independent T_N are consistent with the result of magnetization, resistivity and magnetostriction measurements. These results reveal the stability of antiferromagnetic state in CePt₃Si.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/177/
DOI: 10.1143/JPSJS.75S.177

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