We investigated the low-energy incommensurate (IC) magnetic fluctuations in Sr2RuO4 by the high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. We observed a spin resonance with energy of ℏωres=0.56~meV centered at a characteristic wavevector Qres=(0.3,0.3,0.5). The resonance energy corresponds well to the superconducting gap 2Δ=0.56~meV estimated by the tunneling spectroscopy. The spin resonance shows the L modulation with a maximum at around L=0.5. The L modulated intensity of the spin resonance and our RPA calculations indicate that the superconducting gaps regarding the quasi-one-dimensional α and β sheets at the Fermi surfaces have the horizontal line nodes. These results may set a strong constraint on the pairing symmetry of Sr2RuO4. We also discuss the implications on possible superconducting order parameters.
@article{arxiv.2004.03591,
title = {Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance},
author = {K. Iida and M. Kofu and K. Suzuki and N. Murai and S. Ohira-Kawamura and R. Kajimoto and Y. Inamura and M. Ishikado and S. Hasegawa and T. Masuda and Y. Yoshida and K. Kakurai and K. Machida and S. -H. Lee},
journal= {arXiv preprint arXiv:2004.03591},
year = {2020}
}
Comments
arXiv admin note: substantial text overlap with arXiv:1904.01234