Small superconducting gap on part of the Fermi surface of YNi{sub 2}B{sub 2}C from the de Haas{endash}van Alphen effect

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.5120· OSTI ID:538563

Terashima, T; Haworth, C; Takeya, H; Uji, S; Aoki, H ^[1]; Kadowaki, K ^[2]

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1. National Research Institute for Metals, Sengen 1-2-1, Tsukuba, Ibaraki 305 (Japan)
2. Institute of Materials Science, The University of Tsukuba, 1-1-1, Ten-nodai, Tsukuba, Ibaraki 305 (Japan)

The de Haas{endash}van Alphen oscillation coming from a small electron pocket in the borocarbide superconductor YNi{sub 2}B{sub 2}C (H{sub 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{sub 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 gap on other parts of the Fermi surface. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538563
• Journal Information: Physical Review, B: Condensed Matter, Vol. 56, Issue 9; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
YTTRIUM COMPOUNDS
ENERGY GAP
DE HAAS-VAN ALPHEN EFFECT
NICKEL COMPOUNDS
BORON COMPOUNDS
CARBON COMPOUNDS
OSCILLATIONS
FERMI LEVEL
CRITICAL FIELD
MIXED STATE
TYPE-II SUPERCONDUCTORS