Reduction of the Spin Susceptibility in the Superconducting State of Sr2RuO4 Observed by Polarized Neutron Scattering

A. N. Petsch, M. Zhu, Mechthild Enderle, Z. Q. Mao, Y. Maeno, I. I. Mazin, and S. M. Hayden
Phys. Rev. Lett. 125, 217004 – Published 18 November 2020
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Abstract

Recent observations [A. Pustogow et al., Nature (London) 574, 72 (2019).] of a drop of the O17 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=z^(kx±iky) state and are consistent with several recent proposals for the order parameter including even-parity B1g and odd-parity helical states.

  • Figure
  • Received 7 February 2020
  • Revised 1 July 2020
  • Accepted 14 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.217004

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. N. Petsch1,*, M. Zhu1, Mechthild Enderle2, Z. Q. Mao3,4, Y. Maeno3, I. I. Mazin5, and S. M. Hayden1,†

  • 1H.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
  • 2Institut Laue-Langevin, CS 20156, 38042 Grenoble Cedex 9, France
  • 3Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 4Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 5Department of Physics and Astronomy, George Mason University and Quantum Science and Engineering Center, Fairfax, Virginia 22030, USA

  • *a.petsch@bristol.ac.uk
  • s.hayden@bristol.ac.uk

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Vol. 125, Iss. 21 — 20 November 2020

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