Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-02-08
Phys. Rev. B 79, 052501 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 4 figures, published version
Scientific paper
10.1103/PhysRevB.79.052501
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.
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