J. Phys. Soc. Jpn. 81, SB006 (2012) [7 Pages]
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Proceedings of International Workshop on Heavy Fermions–TOKIMEKI 2011–

Neutron Scattering Study on High-Quality Single Crystals of Non-Centrosymmetric Heavy-Fermion Superconductor CePt3Si

Koji Kaneko1, Oliver Stockert2, Markos Skoulatos3, Astrid Schneidewind4, Tetsuya Takeuchi5,6, Tatsuma D. Matsuda7, Yoshinori Haga7, Rikio Settai6, Yoshichika Ōnuki6,7, and Naoto Metoki1
+ Affiliations
1Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan2Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany3Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany4Gemeinsame Forschergruppe Helmholtz-Zentrum Berlin-TU Dresden, 85747 Garching, Germany5Low Temperature Center Osaka University, Toyonaka, Osaka 560-0043, Japan6Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan7Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Received February 5, 2012

In order to get detailed insights into magnetism and its relationship with superconductivity, neutron scattering experiments were carried out on high-quality single crystals of the non-centrosymmetric heavy-fermion superconductor CePt 3 Si, with T N =2.2 K and T sc ∼0.45 K. All the samples used in this study were characterised via specific heat measurements. Sharp specific heat jumps at T sc =0.45 K, and T N =2.2 K for all samples prove the high quality of the crystal.The neutron diffraction study confirms that an antiferromagnetic peak described with the propagation vector q =(0,0,1/2) persists inside the superconducting state, with a tiny suppression of the magnetic intensity below T sc . In contrast, an external magnetic field along the [001] direction causes a drastic change in the antiferromagnetic state; the antiferromagnetic intensity shows an enormous enhancement with increasing applied field. The magnetic intensity does not show any anomaly at B c2 , instead there exists a small inflection at around B '∼3.8 T where an additional phase boundary was reported. The huge increase in antiferromagnetic intensity corresponds to an increase of the staggered moment under uniform field, opposite of what is observed in ordinary antiferromagnets. These features suggest a weak coupling between magnetic and superconducting order parameters, and clearly evidence the anomalous antiferromagnetism in this compound.

©2012 The Physical Society of Japan
https://doi.org/10.1143/JPSJS.81SB.SB006
KEYWORDS: CePt3Si, non-centrosymmetric, heavy-fermion superconductor, neutron scattering

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