Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-26
Phys. Rev. Lett. 107, 177004 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
to appear in PRL
Scientific paper
Motivated by predictions of a substantial contribution of the "buckling" vibration of the CuO2 layers to d-wave superconductivity in the cuprates, we have performed an inelastic neutron scattering study of this phonon in an array of untwinned crystals of YBa2Cu3O7. The data reveal a pronounced softening of the phonon at the in-plane wave vector q = (0, 0.3) upon cooling below ~ 105 K, but no corresponding anomaly at q = (0.3, 0). Based on the observed in-plane anisotropy, we argue that the electron-phonon interaction responsible for this anomaly supports an electronic instability associated with a uniaxial charge-density modulation and does not mediate d-wave superconductivity.
Bakr M.
Heid Rolf
Hinkov Vladimir
Hradil Klaudia
Keimer Bernhard
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