Flat-band magnetism and helical magnetic order in Ni-doped SrCo2As2

Yu Li, Zhonghao Liu, Zhuang Xu, Yu Song, Yaobo Huang, Dawei Shen, Ni Ma, Ang Li, Songxue Chi, Matthias Frontzek, Huibo Cao, Qingzhen Huang, Weiyi Wang, Yaofeng Xie, Rui Zhang, Yan Rong, William A. Shelton, David P. Young, J. F. DiTusa, and Pengcheng Dai
Phys. Rev. B 100, 094446 – Published 30 September 2019
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Abstract

A series of Sr(Co1xNix)2As2 single crystals was synthesized, allowing a comprehensive phase diagram with respect to field, temperature, and chemical substitution to be established. Our neutron diffraction experiments revealed a helimagnetic order with magnetic moments ferromagnetically aligned in the ab plane and a helimagnetic wave vector of q=(0,0,0.56) for x=0.1. The combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements shows that the tuning of a flat band with dx2y2 orbital character drives the helimagnetism and indicates the possibility of a quantum order-by-disorder mechanism.

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  • Received 7 May 2019
  • Revised 3 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.094446

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yu Li1,2,*, Zhonghao Liu3,†, Zhuang Xu4, Yu Song1, Yaobo Huang5, Dawei Shen3, Ni Ma3, Ang Li3, Songxue Chi6, Matthias Frontzek6, Huibo Cao6, Qingzhen Huang7, Weiyi Wang1, Yaofeng Xie1, Rui Zhang1, Yan Rong4, William A. Shelton8, David P. Young2, J. F. DiTusa2,‡, and Pengcheng Dai1,4,§

  • 1Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
  • 2Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 3State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics, SIMIT, Chinese Academy of Sciences, Shanghai 200050, China
  • 4Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
  • 5Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
  • 6Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 7NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 8Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA

  • *yuli1@lsu.edu
  • lzh17@mail.sim.ac.cn
  • ditusa@phys.lsu.edu
  • §pdai@rice.edu

See Also

Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1xNix)2As2 single crystals

N. S. Sangeetha, L.-L. Wang, A. V. Smirnov, V. Smetana, A.-V. Mudring, D. D. Johnson, M. A. Tanatar, R. Prozorov, and D. C. Johnston
Phys. Rev. B 100, 094447 (2019)

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Vol. 100, Iss. 9 — 1 September 2019

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