TY - JOUR
T1 - Anomalously strong small-q electron-phonon coupling in cuprates due to dielectricity
AU - Weger, M.
PY - 1997/8
Y1 - 1997/8
N2 - We consider the role of the enormous ionic dielectric constant ε0 ≈ 30-50 in the cuprates. The ionically-screened Thomas-Fermi screening parameter q̃TF = [4πe2N(EF)/ε0]1/2 is extremely small, namely 0.2-0.3 Å-1. The electron-phonon coupling constant I(q, ω) is found to be anomalously large for q ≈ q̃TF and small ω, accounting for the CDW observed in overdoped BSCCO with wavevector 0.24 Å-1. Using the Eliashberg theory we derive from this I(q, ω) a maximum Tc of about 200 K. The small electron-phonon scattering angle Δθ = q̃TFkF≈0.3 rad acounts for the observed d-wave pairing, as originating from a phonon-mediated mechananism.
AB - We consider the role of the enormous ionic dielectric constant ε0 ≈ 30-50 in the cuprates. The ionically-screened Thomas-Fermi screening parameter q̃TF = [4πe2N(EF)/ε0]1/2 is extremely small, namely 0.2-0.3 Å-1. The electron-phonon coupling constant I(q, ω) is found to be anomalously large for q ≈ q̃TF and small ω, accounting for the CDW observed in overdoped BSCCO with wavevector 0.24 Å-1. Using the Eliashberg theory we derive from this I(q, ω) a maximum Tc of about 200 K. The small electron-phonon scattering angle Δθ = q̃TFkF≈0.3 rad acounts for the observed d-wave pairing, as originating from a phonon-mediated mechananism.
KW - Cuprates
KW - Dielectricity
KW - Electron-phonon coupling
UR - http://www.scopus.com/inward/record.url?scp=0031198479&partnerID=8YFLogxK
U2 - 10.1007/BF02765733
DO - 10.1007/BF02765733
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AN - SCOPUS:0031198479
SN - 0896-1107
VL - 10
SP - 435
EP - 440
JO - Journal of Superconductivity
JF - Journal of Superconductivity
IS - 4
ER -