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

E. Bascones; T. M. Rice; A. O. Shorikov; V. I. Anisimov

doi:10.1103/PhysRevB.71.012505

paper

Optical Conductivity of Ortho-II YBa $_{2}$ Cu $_{3}$ O $_{6} .5$

arXiv:cond-mat/0406405 · doi:10.1103/PhysRevB.71.012505

Abstract

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 $k_{x} = \pm p i /2$ , 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 ( $π /2, π /2$ ). 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.

5 pages, 2 figures

References in corpus (1)

Circular dichroism and bilayer splitting in the normal state of underdoped (Pb,Bi) $_{2}$ Sr $_{2}$ (Ca $_{x}$ Y $_{1 - x}$ )Cu $_{2}$ O $_{8 + δ}$ and overdoped (Pb,Bi) $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$

Optical Conductivity of Ortho-II YBa2​Cu3​O6​.5

Abstract

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Optical Conductivity of Ortho-II YBa $_{2}$ Cu $_{3}$ O $_{6} .5$