Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

1 Publication
Magnetic quantum oscillations in the normal and superconducting state of nonmagnetic borocarbides
Ignatchik, O.; Bergk, B.; Jäckel, M.; Wosnitza, J.; Souptel, D.; Behr, G.; Canfield, P. C.;
We report on de Haas-van Alphen (dHvA) investigations of the non-magnetic borocarbides YNi2B2C and LuNi2B2C. The measurements were carried out on high-quality single crystals by the torque method in magnetic fields up to 30 T. In the normal state the Fermi-surface topology has been analysed. In comparison with band-structure calculations several deviations are determined. Below the upper critical field, Bc2, in the vortex state an additional damping of the dHvA amplitudes appears. This damping is caused by the evolution from of the superconducting gap parameter. Concerning these topics we observe strong differences between differently grown crystals. The crystals produced by a zone-melting method show an abrupt vanishing of the dHvA signal at the upper critical field Bc2. In contrast, the flux grown crystals display a broader phase transition combined with a continuous decrease of the dHvA amplitude.
  • Poster
    DPG-Frühjahrstagung, 27.-31.03.2006, Dresden, Deutschland

Publ.-Id: 8744 - Permalink