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Reduction of the spin susceptibility in the superconducting state of Sr2RuO4observed by polarized neutron scattering
Physical Review Letters ( IF 8.385 ) Pub Date : 
A. N. Petsch; M. Zhu; Mechthild Enderle; Z. Q. Mao; Y. Maeno; I. I. Mazin; S. M. Hayden

Recent observations [A.~Pustogow .~Nature 574, 72 (2019)] 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 H13Hc2 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=𝐳̂(kx±iky) state and are consistent with several recent proposals for the order parameter including even-parity B1g and odd-parity helical states.
更新日期:2020-10-20

 

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