Superconductivity and electronic structure in MgCNi3

In polycrystalline samples of superconducting MgCNi3, the critical temperature and the specific heat were measured as a function of magnetic field. A Wertheimer–Helfand–Hohenberg (WHH)-like shape of Hc2ðT Þ is observed. The Hc2ðT Þ and specific heat data are discussed on a qualitative level in terms of effective singleand multi-band models based on an orbital assignment of the disjoint Fermi surface sheets (FSS) derived from LDA full potential electronic structure calculations. 2003 Elsevier Science B.V. All rights reserved.