Reflectivity and Microwave Absorption in Crystals with Alternating Intrinsic Josephson Junctions

Details Reflectivity and Microwave Absorption in Crystals with Alternating Intrinsic Josephson Junctions Reflectivity and Microwave Absorption in Crystals with Alternating Intrinsic Josephson Junctions

2001-08-28

arxiv.org/abs/cond-mat/0108449v3

Phys. Rev. Lett. 89,5 (2002) 057003

Physics

Condensed Matter

Superconductivity

4 pages, 4 postscript figures, misprints in table corrected

Scientific paper

10.1103/PhysRevLett.89.057003

We compute the frequency and magnetic field dependencies of the reflectivity $R(\omega)$ in layered superconductors with two alternating intrinsic Josephson junctions with different critical current densities and quasiparticle conductivities for the electric field polarized along the c-axis. The parameter $\alpha$ describing the electronic compressibility of the layers and the charge coupling of neighboring junctions was extracted for the SmLa$_{1-x}$Sr$_{x}$CuO$_{4-\delta}$ superconductor from two independent optical measurements, the fit of the loss function $L(\omega)$ at zero magnetic field and the magnetic field dependence of the peak positions in $L(\omega)$. The experiments are consistent with a free electron value for $\alpha$ near the Josephson plasma frequencies.

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