Singularities in the optical response of cuprates

Details Singularities in the optical response of cuprates Singularities in the optical response of cuprates

2001-01-15

arxiv.org/abs/cond-mat/0101220v1

PHYS. REV. B, v63, 180510 (2001)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.63.180510

We argue that the detailed analysis of the optical response in cuprate superconductors allows one to verify the magnetic scenario of superconductivity in cuprates, as for strong coupling charge carriers to antiferromagnetic spin fluctuations, the second derivative of optical conductivity should contain detectable singularities at $2\Delta +\Delta_{\rm spin}$, $4\Delta$, and $2\Delta+2\Delta_{\rm spin}$, where $\Delta$ is the amplitude of the superconducting gap, and $\Delta_{s}$ is the resonance energy of spin fluctuations measured in neutron scattering. We argue that there is a good chance that these singularities have already been detected in the experiments on optimally doped $YBCO$.

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