Electrodynamics of nearly ferroelectric superconductors

Joseph L. Birman; Natalya A. Zimbovskaya

doi:10.1103/PhysRevB.64.144506

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Electrodynamics of nearly ferroelectric superconductors

Joseph L. Birman, Natalya A. Zimbovskaya

DOI 10.1103/PhysRevB.64.144506 · Physical Review B

T1

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Abstract

We report here the frequency-dependent optical response of a nearly ferroelectric superconductor (NFE-SC), like NaxWO3, or n−SrTiO3. From ω=0, up to a critical frequency ωc1, Meissner-like field extinction occurs as in a usual superconductor. In the “anomalous” region ωc1<ω<ωTO (the TO frequency of the NFE) the field propagates as in a dielectric. For ω>ωTO Meissner-damping recurrs, then at higher ω, dielectriclike propagation is found. Optical anomalies (peaks in transmission) are predicted for a film of NFE-SC below the soft-mode frequency ωTO. 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−SrTiO3 to illustrate this.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NaxWO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
NaxWO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4	Pressure not reported	unknown
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	unknown