Electronic Raman scattering in high-Tc superconductors

Evidence for Two Superconducting Gaps inMgB2

“…When the gap is anisotropic, its k-dependence can be determined by investigating the polarization dependence of the Raman spectra below T c , as different scattering geometries essentially probe different portions of the Fermi surface 16 . In fact, Raman spectroscopy has been successfully used in the studies of the superconducting gap in both conventional 14 and high-T c superconductors 15,16 .…”

“…Raman spectroscopy is an effective technique for studying the superconducting gap in superconductors [14][15][16] . Typically, at temperatures below T c , a superconductivity-induced renormalization in the Raman spectrum occurs as a result of the opening of the superconducting gap.…”