Theory of reduced singlet pairing without the underlying state of charge stripes in the high-temperature superconductor YBa2Cu3O6.45
Hiroyuki Yamase
DOI 10.1103/PhysRevB.79.052501 · Physical Review B
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Abstract
Recently, a strongly enhanced xy anisotropy of magnetic excitations was observed in YBa2Cu3Oy (YBCOy), with y=6.45 and Tc=35 K [V. Hinkov et al., Science 319, 597 (2008)]. Unlike the observation in YBCO6.6 and YBCO6.85, 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 YBCO6.45. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.45 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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