2012/03/23 by J. Tomaschko, S. Scharinger, V. Leca +6
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.86.094509
Submitted to PRL, 5 pages, 3 figures, supplementary information included (4 pages, 4 figures)
arxiv created 2012/03/23 · openalex publication_date 2012/09/07 · arxiv updated 2012/10/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report on a phase sensitive study of the superconducting order parameter of the infinite layer cuprate Sr_1\ensuremath-xLaxCuO2 (SLCO), with x\ensuremath≈0.15. For the study a SLCO thin film was grown epitaxially on a tetracrystal substrate and patterned into direct-current superconducting quantum interference devices (dc SQUIDs). The geometry was designed to be frustrated for d_x2\ensuremath-y2-wave pairing, that is, the SQUID ring comprising the tetracrystal point contains one 0 Josephson junction and one \ensuremathπ Josephson junction, if the order parameter has d_x2\ensuremath-y2-wave symmetry. Our results show that SLCO indeed is a d_x2\ensuremath-y2-wave superconductor. This symmetry thus seems to be inherent to cuprate superconductivity. Subdominant order parameter components can be ruled out at least on a 5% level and may not be a necessary ingredient of high-Tc superconductivity.