The photoemission study of intermetallic compound superconductor YNi2B2C

The photoemission spectrum was measured on YNi2B2C and was found to be well coincident with calculation except in the vicinity of E-F. The DOS peak at E-F predicted by band theory has not been detected. The author suggests that the low energy excitation which is responsible for the suppression of DOS at E-F, is responsible for the pairing of superconductivity as well.