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By use of ultrasound studies we resolved magneto-acoustic quantum oscillationdeep into the mixed state of the multiband nonmagnetic superconductor YNi2B2C.Below the upper critical field, only a very weak additional damping appearsthat can be well explained by the field inhomogeneity caused by the flux-linelattice in the mixed state. This is clear evidence for no or a vanishinglysmall gap for one of the bands, namely, the spheroidal alpha band. Thiscontrasts de Haas--van Alphen data obtained by use of torque magnetometry forthe same sample, with a rapidly vanishing oscillation signal in the mixedstate. This points to a strongly distorted flux-line lattice in the latter casethat, in general, can hamper a reliable extraction of gap parameters by use ofsuch techniques.

Field-induced gapless electron pocket in the superconducting vortex phase of YNi2B2C as probed by magnetoacoustic quantum oscillations