Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.48: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Coexistence of antiferromagnetism and superconductivity in Cd-doped CeCoIn5 — •O. Stockert1, U. Witte2,3, M. Nicklas1, R. Schedler3, K. Kiefer3, J. D. Thompson4, A. D. Bianchi5, Z. Fisk5, and F. Steglich1 — 1Max-Planck-Institut CPfS, Dresden, Germany — 2Institut für Festkörperphysik, TU Dresden, Dresden, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 4Los Alamos National Laboratory, Los Alamos NM, USA — 5University of California, Irvine CA, USA
Starting from the heavy-fermion superconductor CeCoIn5 with a superconducting Tc = 2.3 K, doping with cadmium induces antiferromagnetic order in CeCo(In1−xCdx)5 above a critical Cd concentration xc ≈ 0.005 with a subtle interplay between magnetism and antiferromagnetism. We report on elastic neutron scattering experiments of the heavy-fermion alloy CeCo(In1−xCdx)5 with x = 0.0075 to study the magnetic structure and the influence of superconductivity on the antiferromagnetism. Below TN = 2.4 K and down to lowest temperatures T < 100 mK commensurate antiferromagnetic order with a propagation vector τ = (1/2 1/2 1/2) was detected. The transition into the superconducting state at Tc = 1.7 K is accompanied by a kink in the magnetic intensity followed by a saturation towards lower temperatures at a reduced value. These results indicate a coexistence of antiferromagnetism and superconductivity, but reveal at the same time a strong influence of the superconducting state on the magnetic order. Our results will be discussed in comparison to other heavy-fermion superconductors.