Gap Function with Point Nodes in Borocarbide Superconductor YNi_2B_2C

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dc.creatorIzawa, K.
dc.creatorKamata, K.
dc.creatorNakajima, Y.
dc.creatorMatsuda, Y.
dc.creatorWatanabe, T.
dc.creatorNohara, M.
dc.creatorTakagi, H.
dc.creatorThalmeier, P.
dc.creatorMaki, K.
dc.date2002-05-09
dc.date.accessioned2026-07-07T12:55:46Z
dc.date.available2026-07-07T12:55:46Z
dc.descriptionTo determine the superconducting gap function of a borocarbide superconductor YNi_2B_2C, the c-axis thermal conductivity kappa_zz was measured in a magnetic field rotated in various directions relative to the crystal axes. The angular variation of kappa_zz in H rotated within the ab-plane shows a peculiar fourfold oscillation with narrow cusps. The amplitude of this fourfold oscillation becomes very small when H is rotated conically around the c-axis with a tilt angle of 45 degrees. Based on these results, we provide the first compelling evidence that the gap function of YNi_2B_2C has POINT NODES, which are located along the [100] and [010]-directions. This unprecedented gap structure challenges the current view on the pairing mechanism and on the unusual superconducting properties of borocarbide superconductors.
dc.description5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0205178
dc.identifierhttp://arxiv.org/abs/cond-mat/0205178
dc.identifierPhys.Rev.Lett.89:137006,2002
dc.identifierdoi:10.1103/PhysRevLett.89.137006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224361
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleGap Function with Point Nodes in Borocarbide Superconductor YNi_2B_2C
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