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
1Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195
2Department of Physics, Tohoku University, Sendai 980-8578
3CEA, Departement de Recherche Fondamentale sur la Matière Condensée, 38054 Grenoble Cedex 9, France
4Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
5Low Temperature Center, Osaka University, Toyonaka, Osaka 560-0043
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 Tsc. No significant anomaly has been found in either the Bragg profile or intensity on passing through Tsc within our experimental accuracy. These results indicate a microscopic coexistence of antiferromagnetism and heavy-fermion superconductivity in CePt3Si. Under magnetic fields, TN 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 TN, indicating the enhancement of antiferromagnetic moment of Ce by applying fields. The observed inflection field and the field independent TN are consistent with the result of magnetization, resistivity and magnetostriction measurements. These results reveal the stability of antiferromagnetic state in CePt3Si.
- E. Bauer, G. Hilsher, H. Michor, Ch. Paul, E. W. Scheidt, A. Gribanov, Yu. Seropegin, H. Noël, M. Sigrist and P. Rogl:
Phys. Rev. Lett. 92 (2004) 027003[APS].
- M. Yogi, Y. Kitaoka, S. Hashimoto, T. Yasuda, R. Settai, T. D. Matsuda, Y. Haga, Y. Ōnuki, P. Rogl and E. Bauer:
Phys. Rev. Lett. 93 (2004) 027003[APS].
- N. Metoki, K. Kaneko, T. D. Matsuda, A. Galatanu, T. Takeuchi, S. Hashimoto, T. Ueda, R. Settai, Y. Ōnuki and N. Bernhoeft:
J. Phys.: Condens. Matter 16 (2004) L207[IoP STACKS].
- T. Takeuchi, S. Hashimoto, T. Yasuda, H. Shishido, T. Ueda, M. Yamada, Y. Obiraki, M. Shiimoto, H. Kohara, T. Yamamoto, K. Sugiyama, K. Kindo, T. D. Matsuda, Y. Haga, Y. Aoki, H. Sato, R. Settai and Y. Ōnuki:
J. Phys.: Condens. Matter 16 (2004) L333[IoP STACKS].
- E. Bauer, G. Hilsher, H. Michor, M. Sieberer, E. W. Scheidt, A. Gribanov, Yu. Seropegin, P. Rogl, A. Amato, W. Y. Song, J.-G. Park, D. T. Adroja, M. Nicklas, G. Sparn. M. Yogi and Y. Kitaoka:
Phys. Rev. B 359–361 (2005) 360[APS].
- T. Yasuda, H. Shishido, T. Ueda, S. Hashimoto, R. Settai, T. Takeuchi, T. D. Matsuda, Y. Haga and Y. Ōnuki:
J. Phys. Soc. Jpn. 73 (2004) 1657[JPSJ].
- O. Stockert, E. Faulhaber, G. Zwicknagl, N. Stüßer, H. S. Jeevan, M. Deppe, R. Borth, R. Küchler, M. Loewenhaupt, C. Geibel and F. Steglich:
Phys. Rev. Lett. 92 (2004) 136401[APS].
- O. Stockert et al.: to be published.