Surface Half-Metallicity and Electronic Structure Evolution in A-Type Antiferromagnet EuIn 2 P 2

作者：Yunbo Wu, Tongrui Li, Xiaoli Chen, Zhanfeng Liu, Yuliang Li, Zhengming Shang, Xin Zheng, Hui Tian, Zongyi Wang, Yuehong Bi, Haoyang Zhou, Yi Liu, Guobin Zhang, Lidong Zhang, Aifeng Wang, Qian Li, Shengtao Cui, Zhe Sun · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c01822 · 被引用次数：2 · 研究领域：Iron-based superconductors research、Rare-earth and actinide compounds、Magnetic and transport properties of perovskites and related materials

EuIn 2 P 2, 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 T N, 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 T N, 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 2 P 2 and highlight its promise for spintronic applications.