Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2

Yu Li, Zhiping Yin, Zhonghao Liu, Weiyi Wang, Zhuang Xu, Yu Song, Long Tian, Yaobo Huang, Dawei Shen, D. L. Abernathy, J. L. Niedziela, R. A. Ewings, T. G. Perring, Daniel M. Pajerowski, Masaaki Matsuda, Philippe Bourges, Enderle Mechthild, Yixi Su, and Pengcheng Dai
Phys. Rev. Lett. 122, 117204 – Published 21 March 2019
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Abstract

We use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in SrCo2As2, derived from SrFe2xCoxAs2 iron pnictide superconductors. Our data reveal the coexistence of antiferromagnetic (AF) and ferromagnetic (FM) spin fluctuations at wave vectors QAF=(1,0) and QFM=(0,0)/(2,0), respectively. By comparing neutron scattering results with those of dynamic mean field theory calculation and angle-resolved photoemission spectroscopy experiments, we conclude that both AF and FM spin fluctuations in SrCo2As2 are closely associated with a flatband of the eg orbitals near the Fermi level, different from the t2g orbitals in superconducting SrFe2xCoxAs2. Therefore, Co substitution in SrFe2xCoxAs2 induces a t2g to eg orbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.

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  • Received 8 August 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.117204

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yu Li1,2, Zhiping Yin2,*, Zhonghao Liu3,†, Weiyi Wang1, Zhuang Xu2, Yu Song1, Long Tian2, Yaobo Huang4, Dawei Shen3, D. L. Abernathy5, J. L. Niedziela5, R. A. Ewings6, T. G. Perring6, Daniel M. Pajerowski5, Masaaki Matsuda5, Philippe Bourges7, Enderle Mechthild8, Yixi Su9, and Pengcheng Dai1,2,‡

  • 1Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
  • 2Department of Physics, Beijing Normal University, Beijing 100875, China
  • 3State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics, SIMIT, Chinese Academy of Sciences, Shanghai 200050, China
  • 4Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
  • 5Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, United Kingdom
  • 7Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
  • 8Institut Laue-Langevin, 6 rue Jules Horowitz, Boîte Postale 156, 38042 Grenoble Cedex 9, France
  • 9Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich, Lichtenbergstrasse 1, 85747 Garching, Germany

  • *yinzhiping@bnu.edu.cn
  • lzh17@mail.sim.ac.cn
  • pdai@rice.edu

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Issue

Vol. 122, Iss. 11 — 22 March 2019

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