Optical Conductivity of Ortho-II YBa$_2$Cu$_3$O$_6.5$

Details Optical Conductivity of Ortho-II YBa$_2$Cu$_3$O$_6.5$ Optical Conductivity of Ortho-II YBa$_2$Cu$_3$O$_6.5$

2004-06-17

arxiv.org/abs/cond-mat/0406405v1

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.71.012505

The Ortho-II phase of YBa$_2$Cu$_3$O$_6.5$ is characterized by a periodic alternation of empty Cu and filled Cu-O b-axis doubling the unit cell in the a direction. The extra oxygen in the full chains gives rise to an attractive potential for the holes in the planes. The planar bands split in two with a gap opening at the new Brillouin zone boundary $k_x=\pm pi/2$, which we estimate from LDA calculations. Using a planar model which treats the d-wave superconductivity in a mean field approximation, we show that interband transitions produce a strongly anisotropic feature in the optical conductivity controlled by a region in k-space close to ($\pi/2,\pi/2$). The edge position of this feature gives information on the temperature dependence of quasiparticle spectrum in this region. Bilayer splitting would show up as a double edge shape.

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