Phase-sensitive evidence for dx2-y2-pairing symmetry in the parent-structure high-Tc cuprate superconductor Sr1-xLaxCuO2

Abstract

Even after 25 years of research the pairing mechanism and - at least for electron doped compounds - also the order parameter symmetry of the high transition temperature (high-Tc) cuprate superconductors is still under debate. One of the reasons is the complex crystal structure of most of these materials. An exception are the infinite layer (IL) compounds consisting essentially of CuO2 planes. Unfortunately, these materials are difficult to grow and, thus, there are only few experimental investigations. Recently, we succeeded in depositing high quality films of the electron doped IL compound Sr1-xLaxCuO2 (SLCO), with x approximately 0.15, and on the fabrication of well-defined grain boundary Josephson junctions (GBJs) based on such SLCO films. Here we report on a phase sensitive study of the superconducting order parameter based on GBJ SQUIDs from a SLCO film grown on a tetracrystal substrate. Our results show that also the parent structure of the high-Tc cuprates has dx2-y2-wave symmetry, which thus seems to be inherent to cuprate superconductivity.

Submitted to PRL, 5 pages, 3 figures, supplementary information included (4 pages, 4 figures)

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Cited by in corpus (7)

• Unconventional Superconductivity
• Nodeless superconductivity arising from strong (pi,pi) antiferromagnetism in the infinite-layer electron-doped cuprate Sr1-xLaxCuO2
• Gapped collective charge excitations and interlayer hopping in cuprate superconductors
• Soliton and breather splitting on star graphs from tricrystal Josephson junctions
• Optimal Tc for Electron-Doped Cuprate Realized under High Pressure
• Spontaneous symmetry-breaking in the nonlinear Schrödinger equation on star graphs with inhomogeneities
• Manifestation of the magnetic moments of Cooper pairs in low-temperature properties of superconducting thin-film rings