Small superconducting gap on part of the Fermi surface of YNi2B2C from the de Haas-van Alphen effect

Article

关键词: VORTEX STATE;    II SUPERCONDUCTORS;    MAGNETIC OSCILLATIONS;    QUANTUM OSCILLATIONS;    MIXED-STATE;    2H-NBSE2;    CARBIDE;    FIELDS;    V3SI;   

DOI  :  10.1103/PhysRevB.56.5120

来源: SCIE

【 摘 要 】

The de Haas-van Alphen oscillation coming from a small electron pocket in the borocarbide superconductor YNi2B2C (H-c2=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 H-c2 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 yap on other parts of the Fermi surface.

【 授权许可】

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