Electrodynamics of Nearly-Ferroelectric Superconductors

Details Electrodynamics of Nearly-Ferroelectric Superconductors Electrodynamics of Nearly-Ferroelectric Superconductors

2005-06-17

arxiv.org/abs/cond-mat/0506458v1

Phys. Rev. B, Vol. 64, 144506 (2001)

Physics

Condensed Matter

Superconductivity

8 pages, 3 figures

Scientific paper

10.1103/PhysRevB.64.144506

We report here the frequency-dependent optical response of a nearly ferroelectric superconductor (NFE-SC), like Na$_{x}$WO$_3$, or n-SrTiO$_3$. From $\omega =0$, up to a critical frequency $ \omega_{c1}$, Meissner-like field extinction occurs as in a usual superconductor. In the "anomalous" region $\omega_{c1}<\omega<\omega_{TO}$ (the TO frequency of the NFE) the field propagates as in a dielectric. For $\omega >\omega_{TO}$ Meissner damping recurrs, then at higher $\omega$, dielectriclike propagation is found. New optical anomalies (peaks in transmission) are predicted for a film of NFE-SC below the soft mode frequency $\omega_{TO}$. These effects are due to including the contribution of the NFE displacement current in the solution of the coupled Maxwell, lattice and London equations. Quantitative calculations are given for the NFE-SC n-SrTiO$_3 $ to illustrate this.

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