2020/02/29 by Alexander N. Petsch, A. N. Petsch, M. Zhu +6
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Knight shift #Magnetic and transport properties of perovskites and related materials #Nuclear magnetic resonance #Physics #Physics of Superconductivity and Magnetism #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.125.217004
published as Phys. Rev. Lett. 125, 217004 (2020) · New version with Supplementary Material discussing orbital contributions to the susceptibility, Fermi liquid corrections and a two fluid model
arxiv created 2020/08/26 · openalex created_date 2020/10/29 · openalex publication_date 2020/11/18 · arxiv updated 2020/11/19 · openalex updated_date 2026/08/05
Recent observations [A. Pustogow et al., Nature (London) 574, 72 (2019).NATUAS0028-083610.1038/s41586-019-1596-2] of a drop of the 17O nuclear magnetic resonance (NMR) Knight shift in the superconducting state of Sr2RuO4 challenged the popular picture of a chiral odd-parity paired state in this compound. Here we use polarized neutron scattering (PNS) to show that there is a 34±6% drop in the magnetic susceptibility at the Ru site below the superconducting transition temperature. We measure at lower fields H∼1/3Hc2 than a previous PNS study allowing the suppression to be observed. The PNS measurements show a smaller susceptibility suppression than NMR measurements performed at similar field and temperature. Our results rule out the chiral odd-parity d=z[over ^](kx±iky) state and are consistent with several recent proposals for the order parameter including even-parity B1g and odd-parity helical states.