1996/11/08 by H. Aubin, Kamran Behnia, K. Behnia +4 · 3 citations
Engineering · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Crystal (programming language) #Field (mathematics) #Geometry #Magnetic field #Order (exchange) #Orientation (vector space) #Physics #Physics of Superconductivity and Magnetism #Position (finance) #Quantum mechanics #Superconducting Materials and Applications #Superconductivity #Symmetry (geometry) #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.78.2624
10 pages, 4 figures
arxiv created 1996/11/08 · openalex publication_date 1997/03/31 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The thermal conductivity of a YBa2Cu3O6.9 detwinned single crystal has been studied as a function of the relative orientation of the crystal axes and a magnetic field rotating in the Cu-O planes. Measurements were carried out at several different temperatures below Tc for a field of 30 kOe. A fourfold symmetry characteristic of a superconducting gap with nodes at odd multiples of 45\ifmmode^∘\else\textdegree\fi in k space was resolved. Experiments were performed to exclude a possible macroscopic origin for such a fourfold symmetry and our results impose an upper limit of 10% on the weight of the s-wave component of the essentially d-wave superconducting order parameter of YBCO.