Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet

• DOI: 10.48550/arxiv.2312.11732
• Publication Date: 2023-01-01
• Authors: Han Wu; Jian‐Xin Zhu; Lebing Chen; Matthew Butcher; Ziqin Yue; Dongsheng Yuan; Yu He; Ji Seop Oh; Jianwei Huang; Shan Wu; Cheng Gong; Yucheng Guo; Sung‐Kwan Mo; Jonathan D. Denli...; Dong-Hui Lu; Makoto Hashimoto; M. B. Stone; А. И. Колесников; Songxue Chi; Junichiro Kono; Andriy H. Nevidom...; R. J. Birgeneau; Pengcheng Dai; Ming Yi
• Keywords: Physical sciences; Condensed Matter - Strongly Correlated Electrons; Condensed Matter - Materials Science; Engineering; Chemical sciences; Strongly Correlated Electrons (cond-mat.str-el); Physical Sciences; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; Condensed Matter Physics

The two-dimensional (2D) material Cr$_2$Ge$_2$Te$_6$ is a member of the class insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in detailed temperature dependence study, we identify clear response electronic structure to dimensional crossover form two distinct scales marking onsets modifications structure. Specifically, observe Te $p$-orbital-dominated bands undergo changes at Curie transition T$_C$ while Cr $d$-orbital-dominated begin evolving higher scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, find that system can be consistently understood respond sequentially temperatures which in-plane out-of-plane spin correlations exceed characteristic length Our findings reveal sensitivity orbital-selective for probing dynamical evolution local moment vdW