journal article·2021-04-05Open access

Flat-band-induced itinerant ferromagnetism in RbCo2Se2

Jianwei Huang, Zhicai Wang, Hongsheng Pang, Han Wu, Huibo Cao, Sung-Kwan Mo, Avinash Rustagi, A. F. Kemper, Meng Wang, Ming Yi, R. J. Birgeneau

Physical Review B· Volume 103· Issue 16

Abstract

$A{\mathrm{Co}}2{\mathrm{Se}}2$ ($A$=K, Rb, Cs) is a homologue of the iron-based superconductor $A{\mathrm{Fe}}2{\mathrm{Se}}2$. From a comprehensive study of ${\mathrm{RbCo}}2{\mathrm{Se}}2$ via measurements of magnetization, transport, neutron diffraction, angle-resolved photoemission spectroscopy, and first-principles calculations, we identify a ferromagnetic order accompanied by an orbital-dependent spin splitting of the electronic dispersions. Furthermore, we identify the ordered moment to be dominated by a ${d}_{{x}2\ensuremath{-}{y}2}$ flat band near the Fermi level, which exhibits the largest spin splitting across the ferromagnetic transition, suggesting an itinerant origin of the ferromagnetism. In the broader context of the iron-based superconductors, we find this ${d}_{{x}2\ensuremath{-}{y}2}$ flat band to be a common feature in the band structures of both iron chalcogenides and iron pnictides, accessible via heavy electron doping.
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Research context

OpenAlex topics: Iron-based superconductors research · Intellectual Capital and Performance Analysis

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Affiliations

Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA

School of the Gifted Young, University of Science and Technology of China, Hefei, Anhui 230026, China

Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA

School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA

School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China

Department of Physics, University of California, Berkeley, California 94720, USA

Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Funding

U.S. Department of Energy · Oak Ridge National Laboratory · Welch Foundation · Alfred P. Sloan Foundation · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · National Basic Research Program of China · National Science Foundation

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