Author/Authors :
J. Ka?mar??k، نويسنده , , Z. Pribulov?، نويسنده , , P. Szab?، نويسنده , , P. Samuely، نويسنده , , C. Marcenat، نويسنده , , T. Klein، نويسنده , , D.-J. Jang، نويسنده , , H.-G. Lee، نويسنده , , H.-S. Lee، نويسنده , , S.I. Lee، نويسنده ,
Abstract :
Even though MgCNi3 contains large molar volume of magnetic Ni atoms it clearly shows superconductivity. The origin of superconductivity in this material has not yet been clarified. There is a lot of discrepancy in experimental results and physical interpretation where even unconventional pairing or a two-band model have been proposed for the system. All that is based on results obtained on polycrystalline samples. Here we present the first point-contact spectroscopy and ac-calorimetry measurements on the MgCNi3 single crystals of very good quality. Measurements have been performed in the temperature range from 1.5 to 10 K and in magnetic fields up to 8 T. The temperature dependence of the energy gap of the system is presented and compared to the BCS model.
