Magnetic Fluctuations in Unconventional Superconductor Investigated by Pulsed Neutron Source

Abstract

We investigate incommensurate magnetic fluctuations in Sr₂RuO₄ by inelastic neutron scattering using the chopper spectrometer AMATERAS. Below T_c, we found the spin resonance at Q = (0.3, 0.3, 0.5) with energy of the superconducting gap 2Δ. This result strongly indicates that the superconducting gap of Sr₂RuO₄ has horizontal line nodes.