Thomas Lee Elifritz

http://arxiv.org/abs/1206.4333

Direct observation of competition between superconductivity and charge density wave order in YBa₂Cu₃O_y, J. Chang, E. Blackburn, A. T. Holmes, N. B. Christensen, J. Larsen, J. Mesot, Ruixing Liang, D. A. Bonn, W. N. Hardy, A. Watenphul, M. v. Zimmermann, E. M. Forgan and S. M. Hayden

Here we report a hard (100 keV) X-­‐ray diffraction study, in magnetic fields up to 17 T, of a de-twinned single crystal of YBa₂Cu₃O_6.67 (with ortho-­‐VIII oxygen ordering, T_c = 67 K and p = 0.12 where p is the hole concentration per planar Cu). We find that a CDW forms in the normal state below T_CDW ≈ 135 K. The charge modulation has two fundamental wavevectors q_CDW= q₁ = (δ₁, 0, 0.5) and q₂ = (0, δ₂, 0.5), where δ₁ ≈ 0.3045(2) and δ₂≈0.3146(7).

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