Theory of reduced singlet pairing without the underlying state of charge stripes in the high-temperature superconductor YBa_2Cu_3O_6.45

Abstract

Recently, a strongly enhanced xy anisotropy of magnetic excitations was observed in YBa_2Cu_3O_y (YBCO_y) with y=6.45 and Tc=35 K [Science 319, 597 (2008)]. Unlike the observation in YBCO_6.6 and YBCO_6.85, the anisotropy grows to be pronounced at lower temperature and at lower energy, and is not suppressed by the onset of superconductivity. We propose that the effect of singlet pairing is substantially reduced in YBCO_6.45. This reduction concomitantly enhances an order competing with singlet pairing, a strong tendency of the so-called d-wave Pomeranchuk instability, leading to the magnetic excitations observed experimentally.

11 pages, 4 figures, published version

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Cited by in corpus (5)

• Lattice symmetry breaking in cuprate superconductors: Stripes, nematics, and superconductivity
• Stripes and electronic quasiparticles in the pseudogap state of cuprate superconductors
• Tendencies toward nematic order in YBa2Cu3O6+x: Uniform distortion vs. incipient charge stripes
• Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors