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. Schultz1 — 1Institut 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.