Surface Half-Metallicity and Electronic Structure Evolution in A-Type Antiferromagnet EuIn<sub>2</sub>P<sub>2</sub>

EuIn<sub>2</sub>P<sub>2</sub>, an A-type antiferromagnet, presents a compelling platform for exploring half-metallicity due to its layered structure and contrasting intra/interlayer magnetic ordering. Using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), we investigate the electronic structure evolution across its magnetic transition. Below <i>T</i><sub>N</sub>, ARPES reveals a Fermi level band splitting, indicative of a surface ferromagnetic exchange interaction. Notably, only one of the split bands crosses the Fermi level, suggesting potential surface half-metallicity. DFT calculations confirm this, showing no splitting in the bulk antiferromagnetic phase but reproducing the splitting in a ferromagnetic configuration. Above <i>T</i><sub>N</sub>, the band splitting collapses, accompanied by a Fermi surface volume change, reflecting the restoration of spin degeneracy. Surface potassium doping studies demonstrate tunable band dispersions and effective masses, highlighting the interplay between electron correlation and carrier concentration. Our results reveal surface ferromagnetism in EuIn<sub>2</sub>P<sub>2</sub> and highlight its promise for spintronic applications.

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Publication Details

Journal
Nano Letters
Published
2025-06-18
DOI
https://doi.org/10.1021/acs.nanolett.5c01822
Citations
1
Primary Topic
Iron-based superconductors research
Type
article
Field-Weighted Citation Impact
0.43

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article en
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Abstract

EuIn<sub>2</sub>P<sub>2</sub>, an A-type antiferromagnet, presents a compelling platform for exploring half-metallicity due to its layered structure and contrasting intra/interlayer magnetic ordering. Using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), we investigate the electronic structure evolution across its magnetic transition. Below <i>T</i><sub>N</sub>, ARPES reveals a Fermi level band splitting, indicative of a surface ferromagnetic exchange interaction. Notably, only one of the split bands crosses the Fermi level, suggesting potential surface half-metallicity. DFT calculations confirm this, showing no splitting in the bulk antiferromagnetic phase but reproducing the splitting in a ferromagnetic configuration. Above <i>T</i><sub>N</sub>, the band splitting collapses, accompanied by a Fermi surface volume change, reflecting the restoration of spin degeneracy. Surface potassium doping studies demonstrate tunable band dispersions and effective masses, highlighting the interplay between electron correlation and carrier concentration. Our results reveal surface ferromagnetism in EuIn<sub>2</sub>P<sub>2</sub> and highlight its promise for spintronic applications.

Nano LettersVol. 25(26)
University of Science and Technology of China (CN), Chongqing University (CN), Quantum Devices (United States) (US), Temper (United States) (US), Collaborative Innovation Center of Advanced Microstructures (CN), National Synchrotron Radiation Laboratory (CN), BioElectronics (United States) (US), ZheJiang East Crystal Electronic (China) (CN), PRG S&Tech (South Korea)
National Natural Science Foundation of China, Chinese Academy of Sciences, China Postdoctoral Science Foundation, Hefei Science Center, Chinese Academy of Sciences, National Key Research and Development Program of China, Fundamental Research Funds for the Central Universities
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Iron-based superconductors research
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