Coupling of Charge Carriers to the Spin Fluctuation

In an electron-phonon system the electron-phonon interaction spectral density, α2F(ω), is approximately equal to W(ω) defined as:
                           α2F(ω)≈W(ω)=(1/2π)d2[ωRe(σ-1(ω))]/dω2   (1)
Where, Re(σ(ω)) is the real part of the optical conductivity. For the electron-spin interaction systems this relation could be converted to I2χ(ω)≈W(ω), where I is the coupling constant of electron-spin interaction and χ(ω) is the imaginary part [...]

Is Continuum Background More Important Than Resonance Mode?

The observed sharp ‘kink’ in the ARPES has been related to the phonon or magnetic mode as a possible signature of the force that create the superconducting state in HTSCs. A group of scientists from Canada and the USA have studied this situation by Fourier-transform infrared (FTIR) spectroscopy of optimally doped (Tc=96 K) and highly [...]