The de Haas-van Alphen oscillation coming from a small electron pocket in the borocarbide superconductor YNi2B2C (Hc2 = 8.8 T) has been observed in the vortex state down to a surprisingly low field of 2 T. The oscillation amplitude is strongly suppressed in a field region immediately below Hc2 but recovers at lower fields. The observed amplitude at low fields is much larger than theoretical predictions based on a literature value of the superconducting gap. It is argued that the gap opening on this particular Fermi surface is much smaller than the gap on other parts of the Fermi surface.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1997 Sep 1|
ASJC Scopus subject areas
- Condensed Matter Physics