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

Li, Yu; Liu, Zhonghao; Xu, Zhuang; Song, Yu; Huang, Yaobo; Shen, Dawei; Ma, Ni; Li, Ang; Chi, Songxue; Frontzek, Matthias; Cao, Huibo; Huang, Qingzhen; Wang, Weiyi; Xie, Yaofeng; Zhang, Rui; Rong, Yan; Shelton, William A.; Young, David P.; DiTusa, J. F.; Dai, Pengcheng

doi:10.1103/PhysRevB.100.094446

Title: Flat-band magnetism and helical magnetic order in Ni-doped ${SrCo}_{2} {As}_{2}$

Journal Article · 30 September 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.094446 · OSTI ID:1569360

^[1]; Liu, Zhonghao ^[2]; Xu, Zhuang ^[3]; Song, Yu ^[4]; Huang, Yaobo ^[5]; Shen, Dawei ^[2]; Ma, Ni ^[2]; Li, Ang ^[2]; Chi, Songxue ^[6]; Frontzek, Matthias ^[6]; Cao, Huibo ^[6]; Huang, Qingzhen ^[7]; Wang, Weiyi ^[4]; Xie, Yaofeng ^[4]; Zhang, Rui ^[4]; Rong, Yan ^[3]; Shelton, William A. ^[8]; Young, David P. ^[9]; DiTusa, J. F. ^[9]; Dai, Pengcheng ^[10]

Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy; Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Chinese Academy of Sciences, Shanghai (China). State Key Lab. of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics
Beijing Normal Univ., Beijing (China). Center for Advanced Quantum Studies and Dept. of Physics
Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
Chinese Academy of Sciences, Shanghai (China). Shanghai Inst. of Applied Physics, Shanghai Synchrotron Radiation Facility
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
National Inst. of Standards and Technology, Gaithersburg, MA (United States). NIST Center for Neutron Research
Lousiana State Univ., Baton Rouge, LA (United States). Dept. of Chemical Engineering
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy; Beijing Normal Univ., Beijing (China). Center for Advanced Quantum Studies and Dept. of Physics

A series of Sr(Co_1-$$x$$Ni_$$x$$)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. Finally, the combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements shows that the tuning of a flat band with $$d_{x^2-y^2}$$ orbital character drives the helimagnetism and indicates the possibility of a quantum order-by-disorder mechanism.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1569360

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr ( Co 1 − x Ni x ) 2 As 2 single crystals Sangeetha, N. S.; Wang, L. -L.; Smirnov, A. V. Physical Review B, Vol. 100, Issue 9 https://doi.org/10.1103/physrevb.100.094447	journal	September 2019
Helical magnetic ordering in Sr ( Co 1 − x Ni x ) 2 As 2 Wilde, J. M.; Kreyssig, A.; Vaknin, D. Physical Review B, Vol. 100, Issue 16 https://doi.org/10.1103/physrevb.100.161113	journal	October 2019

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Title: Flat-band magnetism and helical magnetic order in Ni-doped ${SrCo}_{2} {As}_{2}$