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Suppression of the susceptibility in superconducting Sr<sub>2</sub>RuO<sub>4</sub> observed by polarized neutron scattering

ORAL

Abstract

The superconducting state of Sr2RuO4 was considered to inhere chiral-triplet pairing analogue to the superfluid 3He-A phase [1]. This has recently been challenged by observations of a reduced 17O-NMR Knight shift in the superconducting state [2]. Here we present a new measurement of the spin susceptibility by polarized neutron scattering. The results show consistent with NMR [2] a suppression below the superconducting transition and reject the previously accepted picture. Differences to a previous polarized neutron scattering study at higher magnetic field [3] are understood by a complex field dependence and lesser statistics. Quantitatively, these results are consistent with different gap states than NMR [2] but support recent proposals such as nodal s’+id or d+ig [4].
[1] Maeno et al., Nature 372, 532 (1994); Rice et al., J. Phys.: Condens. Matter 7, L643 (1995)
[2] Pustogow et al., Nature 574, 72 (2019); Ishida et al., J. Phys. Soc. Jpn. 89, 034712 (2020); Chronister et al., arXiv:2007.13730 (2020)
[3] Duffy et al., Phys. Rev. Lett. 85, 5412 (2000)
[4] Rømer et al., Phys. Rev. Lett. 123, 247001 (2019)

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Presenters

  • Alexander Petsch

    Univ of Bristol

Authors

  • Alexander Petsch

    Univ of Bristol

  • Mengze Zhu

    Univ of Bristol

  • Mechthild Enderle

    Institut Laue-Langevin

  • Zhiqiang Mao

    Pennsylvania State University, Department of Physics, Penn State University, The Pennsylvania State University, Penn State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University

  • Yoshiteru Maeno

    Physics, Kyoto University, Kyoto University, Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Kyoto Univ, Department of Physics, Kyoto University

  • Igor Mazin

    Physics & Astronomy, George Mason University, Department of Physics and Astronomy, George Mason University, George Mason University, Physics and Astronomy, George Mason University, Physics, George Mason University, Department of Physics and Astronomy,, George Mason University, Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University – Fairfax, VA, USA

  • Stephen Hayden

    Univ of Bristol