The c axis optical conductivity of layered systems in the superconducting state

Details The c axis optical conductivity of layered systems in the superconducting state The c axis optical conductivity of layered systems in the superconducting state

1997-01-06

arxiv.org/abs/cond-mat/9701028v1

PHYS REV B 55: (18) 12748-12752 MAY 1 1997

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.55.12748

In this paper, we discuss the c axis optical conductivity Re [sigma_c(omega)] in the high T_c superconductors, in the superconducting state. The basic premise of this work is that electrons travelling along the c axis between adjacent CuO_2 layers must pass through several intervening layers. In earlier work we found that, for weak inter-layer coupling, it is preferable for electrons to travel along the c axis by making a series of interband transitions rather than to stay within a single (and very narrow) band. Moreover, we found that many of the properties of the normal state optical conductivity, including the pseudogap could be explained by interband transitions. In this work we examine the effect of superconductivity on the interband conductivity. We find that, while the onset of superconductivity is clearly evident in the spectrum, there is no clear signature of the symmetry of the superconducting order parameter.

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