Field-induced gapless electron pocket in the superconducting vortex phase of YNi2 B2C as probed by magnetoacoustic quantum oscillations
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Contributors
Abstract
By use of ultrasound studies we resolved magnetoacoustic quantum oscillation deep into the mixed state of the multiband nonmagnetic superconductor YNi2B2C. Below the upper critical field, only a very weak additional damping appears that can be well explained by the field inhomogeneity caused by the flux-line lattice in the mixed state. This is clear evidence for no or a vanishingly small gap for one of the bands, namely, the spheroidal α band. This contrasts de Haas-van Alphen data obtained by use of torque magnetometry for the same sample, with a rapidly vanishing oscillation signal in the mixed state. This points to a strongly distorted flux-line lattice in the latter case that, in general, can hamper a reliable extraction of gap parameters by use of such techniques.
Details
Original language | English |
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Article number | 014523 |
Journal | Physical Review B |
Volume | 95 |
Issue number | 1 |
Publication status | Published - 30 Jan 2017 |
Peer-reviewed | Yes |