We have found clear anisotropy in the ab plane with fourfold symmetry of the resistive superconducting transition under magnetic fields for single-crystal Pb2Sr2Y0.62Ca0.38Cu 3O8 , which is regarded as anisotropy of the upper critical field Hc2. This is not only qualitatively but also quantitatively similar to that formerly observed in La1.86Sr0.14CuO4 . The observed fourfold symmetry is explained as being mainly due to the anisotropy of the superconducting energy gap owing to dx2-y2 pairing. Hc2 , one of the bulk properties, supports dx2-y2 pairing in the high-Tc superconductivity.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics