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Dresden 2003 – scientific programme

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TT: Tiefe Temperaturen

TT 10: Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen II

TT 10.3: Talk

Tuesday, March 25, 2003, 15:15–15:30, HSZ304

Complex behavior of the superconducting perovskite MgCNi3 — •A. Wälte1, H. Rosner2, M.D. Johannes3, G. Fuchs1, K.-H. Müller1, A. Handstein1, K. Nenkov1, V.N. Narozhnyi1, S.L. Drechsler1, S. Shulga1, and L. Schultz11Institut für Festkörper- und Werkstoffforschung Dresden, Helmholtzstr. 20, D-01171 Dresden — 2MPI CPFS Dresden, Nöthnitzer Str. 40, 01187 Dresden — 3Department of Physics, University of California, Davis, California 95616

The superconducting properties of MgCxNi3, a recently discovered perovskite superconductor [1] were characterized by measurements of the specific heat in a temperature range between 2 and 300K, the resistivity and the ac–susceptibility. The analysis of the specific heat data revealed a strongly enhanced value for the jump of the superconducting transition at Tc ≈ 7 K which can be explained in the framework of a two–band s–wave model. Below T ≈ 10 K the temperature dependence of the specific heat is characteristic for the contribution of ferromagnetic spin–fluctuations. The influence of paramagnons gives the possibility of p–wave symmetry of the order parameter and is discussed in comparisson with the unconventional superconductor Sr2RuO4.
T. He et al. Superconductivity in the non-oxide perovskite MgCNi3. Nature, Vol. 411, May 2001.

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