Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
de Haas-van Alphen investigations on the nonmagnetic superconductors LuNi2B2C and YNi2B2C
Bergk, B.; Ignatchik, O.; Bartkowiak, M.; Petzold, V.; Rosner, H.; Canfield, P. C.; Behr, G.; Sheikin, I.; Perenboom, J.; Wosnitza, J.
We present de Haas-van Alphen (dHvA) investigations on the nonmagnetic borocarbide
Finally, we are able to determine the angular dependences of the electron-phonon coupling for the different Fermi-surface sheets.
Below the upper critical field, Bc2, an additional damping of the oscillation amplitude appears. This decrease might be related to the increase of the superconducting gap parameter which could be calculated from quantitative measurements of this effect. However, the analysis is hampered by additional influences originating form changes in the flux-line lattice that appear close to the superconducting phase transition. Therefore, we compare two differently grown crystals. The one grown by a zone-melting method shows a rather abrupt vanishing of the oscillation amplitude in the superconducting state. In contrast, for the flux-grown crystals we observe a smooth damping
combined with a broad phase transition.
International School "Magnetic Fields for Science", 27.08.-08.09.2007, Cargèse, France