Abstract
We have found clear anisotropy in the ab plane with fourfold symmetry of the resistive superconducting transition under magnetic fields for single-crystal Pb2Sr2Y0.62Ca0,38Cu3O8, 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\(d_{x^2 - y^2 }\) pairing. Hc2, one of the bulk properties, supports\(d_{x^2 - y^2 }\) pairing in the high-Tc superconductivity.
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Noji, T., Takabayashi, T., Nishizaki, T. et al. Fourfold symmetry in the ab-plane of the upper critical field for the high-Tc cuprates. J Low Temp Phys 105, 533–538 (1996). https://doi.org/10.1007/BF00768440
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DOI: https://doi.org/10.1007/BF00768440