Gap Function with Point Nodes in Borocarbide SuperconductorYNi2B2C

2002/05/09 by K. Izawa, Kenji Kamata, K. Kamata +12 · 1 citation
Chemistry · Mathematics · Physics and Astronomy · #Amplitude #Chemistry #Condensed matter physics #Function (biology) #Geometry #Kappa #Mathematics #Optics #Oscillation (cell signaling) #Pairing #Physics #Physics of Superconductivity and Magnetism #Plane (geometry) #Point (geometry) #Rare-earth and actinide compounds #Superconductivity #Superconductivity in MgB2 and Alloys #Tilt (camera) #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.89.137006

published as Phys.Rev.Lett.89:137006,2002 · 5 pages, 3 figures

arxiv created 2002/05/09 · openalex publication_date 2002/09/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

To determine the superconducting gap function of YNi₂B₂C, the c-axis thermal conductivity \ensuremathκ_zz wasmeasured in \mathbitH rotated in various directions. The angularvariation of \ensuremathκ_zz in \mathbitH rotated within the ab plane shows a peculiar fourfold oscillation withnarrow cusps. The amplitude of this fourfold oscillation becomes verysmall when \mathbitH is rotated conically around the c axis with a tilt angle of 45\ifmmode^∘\else\textdegree\fi. These results provide the firstcompelling evidence that the gap function has point nodes located along the a and b axes. This unprecedented gap structure challenges the current viewon the pairing mechanism.

Citations

• Temperature Dependence of the Flux Line Lattice Transition into Square Symmetry in SuperconductingLuNi2B2C
• Highly Anisotropic Gap Function in Borocarbide SuperconductorLuNi2B2C
• Angular Position of Nodes in the Superconducting Gap of YBCO
• Phenomenological theory of unconventional superconductivity

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