Evidence of Doping-Dependent Pairing Symmetry in Cuprate Superconductors

2001/08/03 by N.-C. Yeh, N. -C. Yeh, C. -T. Chen +14 · 3 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.87.087003

published as Phys. Rev. Lett. 87, 087003 (2001) · 4 pages, 4 figures. Published in Physical Review Letters. Corresponding author: Nai-Chang Yeh (e-mail address: [email protected])

openalex publication_date 2001/08/03 · arxiv created 2001/08/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Scanning tunneling spectroscopy studies reveal long-range spatial homogeneity and predominantly d_x²\ensuremath-y²-pairing spectral characteristics in under- and optimally doped YBa₂Cu₃O_7\ensuremath-\ensuremathδ superconductors, whereas STS on YBa₂(Cu_0.9934Zn_0.0026Mg_0.004)₃O_6.9 exhibits microscopic spatial modulations and strong scattering near the Zn or Mg impurity sites, together with global suppression of the pairing potential. In contrast, in overdoped (Y_0.7Ca_0.3)Ba₂Cu₃O_7\ensuremath-\ensuremathδ, (d_x²\ensuremath-y²+s)-pairing symmetry is found, suggesting significant changes in the superconducting ground state at a critical doping value.

Citations

• Measuring condensate fraction in superconductors
• The pseudogap in high-temperature superconductors: an experimental survey

Cited by

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• Local and macroscopic tunneling spectroscopy ofY1−xCaxBa2Cu3O7−δfilms: Evidence for a doping-dependentisoridxycomponent in the order parameter
• Collective modes and quasiparticle interference on the local density of states of cuprate superconductors