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  • Letter

Spin fluctuations in Sr1.8La0.2RuO4

Zheng He1, Qisi Wang1,2,*, Yu Feng1,3,4, Chul Kim5, Wonshik Kyung6,7, Changyoung Kim6,7, Hongliang Wo1,8, Gaofeng Ding1,8, Yiqing Hao1 et al.

Feiyang Liu1, Helen C. Walker9, Devashibhai T. Adroja9,10, Astrid Schneidewind11, Wenbin Wang12, and Jun Zhao1,12,8,13,†

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • 2Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
  • 3Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
  • 4Spallation Neutron Source Science Center (SNSSC), Dongguan 523803, China
  • 5Institute of Physics and Applied Physics, Yonsei University, Seoul 03722, Korea
  • 6Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea
  • 7Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
  • 8Shanghai Qi Zhi Institute, Shanghai 200232, China
  • 9ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
  • 10Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
  • 11Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr.1, 85748 Garching, Germany
  • 12Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
  • 13Shanghai Research Center for Quantum Sciences, Shanghai 201315, China

  • *qwang@cuhk.edu.hk
  • †zhaoj@fudan.edu.cn
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Phys. Rev. B 107, L201107 – Published 9 May, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L201107

Abstract

We use inelastic neutron scattering to study spin fluctuations in Sr1.8La0.2RuO4, where Lanthanum doping triggers a Lifshitz transition by pushing the van Hove singularity in the γ band to the Fermi energy. Strong spin fluctuations emerge at an incommensurate wave vector Qic=(0.3,0.3), corresponding to the nesting vector between α and β Fermi sheets. The incommensurate antiferromagnetic fluctuations shift toward (0.25,0.25) with increasing energy up to ∼110 meV. By contrast, scatterings near the ferromagnetic wave vectors Q=(1,0) and (1,1) remain featureless at all energies. This contradicts the weak-coupling perspective that suggests a sharp enhancement of ferromagnetic susceptibility due to the divergence of density of states in the associated γ band. Our findings imply that ferromagnetic fluctuations in Sr2RuO4 and related materials do not fit into the weak-coupling paradigm, but instead are quasilocal fluctuations induced by Hund's coupling. This imposes significant constraints for the pairing mechanism involving spin fluctuations.

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Phys. Rev. B 107, L201107– Published 9 May, 2023
  • Received 12 December 2021
  • Revised 23 March 2023
  • Accepted 5 April 2023
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