Small superconducting gap on part of the Fermi surface of YNi2B2C from the de Haas–van Alphen effect
T. Terashima, C. Haworth, H. Takeya, S. Uji, H. Aoki, K. Kadowaki
DOI 10.1103/PhysRevB.56.5120 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.6 | Pressure not reported | unknown |
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.9 | Pressure not reported | onset |
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