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.

arXiv comment11 pages, 4 figures, published version

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• Spontaneous symmetry breaking by charge stripes in the high-pressure phase of superconducting La(1.875)Ba(0.125)CuO(4)
• Possible charge instabilities in two-dimensional doped Mott insulators
• Incommensurate nematic fluctuations in two dimensional metals
• Magnetic field-enhanced spin freezing in YBa2Cu3O6.45 at the verge of the competition between superconductivity and charge order
• Fermi surface truncation from thermal nematic fluctuations
• Spontaneous Fermi surface symmetry breaking in bilayered systems
• Spin nematic fluctuations near a spin-density-wave phase
• Stripes and electronic quasiparticles in the pseudogap state of cuprate superconductors
• Strong particle-hole asymmetry of charge instabilities in doped Mott insulators
• Enhanced nematic fluctuations near an antiferromagnetic Mott insulator and possible application to high-$T_c$ cuprates
• Raman scattering near a d-wave Pomeranchuk instability
• 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
• Electronic nematic phase transition in the presence of anisotropy
• Mean-field theory on a coupled system of ferromagnetism and electronic nematic order
• Photoemission signatures of valence-bond stripes in cuprates: Long-range vs. short-range order
• Self-energy effects in cuprates and the dome-shaped behavior of the superconducting critical temperature
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors