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 04:00:00 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, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

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