Abstract
We suggest that the stripe wave-vector qstripe=0.24 A−1 can be identified with the electronic Debye screening parameter \( \tilde q_D = q_D /\sqrt {\varepsilon _{10n} }\). As a result, the electron-ion potential \( \bar V(q) = 4\pi Ze^2 /(q^2 + \tilde q_D^2 )\) is greatly enhanced for small q values. This gives rise to an extremely strong coupling scenario that differs from standard strong-coupling theory by having a frequency-dependent coupling, arising from the frequency dependence of ε10n. The solutions of the Eliashberg equations for this situation are similar to the “standard” solutions along the imaginary (Matsubara) frequency axis, but differ significantly along the real frequency axis, possessing states in the gap, anomalously large values of 2Δ0/Tc, and other interesting features. Tc is enhanced significantly, giving a maximum Tc of about 200 K for “typical” values λ≈1 of the unrenormalized coupling constant.
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Weger, M., Peter, M. (2002). Enhancement of Electron-Phonon Coupling in Exotic Superconductors near a Ferroelectric Transition. In: Bianconi, A., Saini, N.L. (eds) Stripes and Related Phenomena. Selected Topics in Superconductivity, vol 8. Springer, Boston, MA. https://doi.org/10.1007/0-306-47100-0_52
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DOI: https://doi.org/10.1007/0-306-47100-0_52
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