[Zurück]

E. Bauer, G. Hilscher, H. Michor, M. Sieberer, E. Scheidt, A. Gribanov, Y. Seropegin, P. Rogl, A. Amato, W.Y. Song, J.-G. Park, D.T. Adroja, M. Nicklas, G. Sparn, M. Yogi, Y. Kitaoka:
"Unconventional superconductivity and magnetism in CePt₃Si_1-xGe_x";
Physica B: Condensed Matter, 359-361 (2005), S. 360 - 367.

Unconventional superconductivity and magnetism in CePt₃Si_1-xGe_x

E. Bauer a, G. Hilscher a, H. Michor a, M. Sieberer a, E.W. Scheidt b, A. Gribanov c, Yu. Seropegin c, P. Rogld, A. Amato e, W.Y. Song f, g, J.-G. Park g, D.T. Adroja f, M. Nicklas h, G. Sparn h, M. Yogi i and Y. Kitaoka i

a Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria
b Chemische Physik und Materialwissenschaften, Universität Augsburg, D-86159 Augsburg, Germany
c Department of Chemistry, Moscow State University, Moscow, Russian Federation
d Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria
e Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
f ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK
g Department of Physics and Institute of Basic Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea
h Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
i Department of Materials Science and Technology, Osaka University, Osaka 560-8531, Japan

Available online 16 February 2005.

Abstract

CePt₃Si is a novel ternary compound exhibiting antiferromagnetic order at T_N~ 2.2 K and superconductivity (SC) at T_c ~ 0.75 K. Large values of H'_c2 ~ -8.5 T/K and H_c2(0) ~ 5 T indicate Cooper pairs formed out of heavy quasiparticles. The mass enhancement originates from Kondo interaction with a characteristic temperature T_K ~ 8 K. NMR and μSR measurements evidence coexistence of SC and long-range magnetic order on a microscopic scale. Moreover, CePt₃Si is the first heavy fermion SC without an inversion symmetry. This gives rise to a novel type of NMR relaxation rate 1/T₁ which is very unique and never reported before for other heavy fermion superconductors. Studies of Si/Ge substitution allow us to establish a phase diagram.

Keywords: CePt₃Si; Superconductivity; Antiferromagnetism

PACS: 74.70.Tx; 71.27.+a; 75.30.Mb

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937918

http://dx.doi.org/10.1016/j.physb.2005.01.062