Two-step electronic response to magnetic ordering in a van der Waals ferromagnet

Han Wu; Jian-Xin Zhu; Lebing Chen; Matthew W. Butcher; Ziqin Yue; Dongsheng Yuan; Yu He; Ji Seop Oh; Bin Gao; Jianwei Huang; Shan Wu; Cheng Gong; Yucheng Guo; Sung-Kwan Mo; Jonathan Denlinger; Donghui Lu; Makoto Hashimoto; Matthew B. Stone; Alexander I. Kolesnikov; Songxue Chi; Junichiro Kono; Andriy H. Nevidomskyy; Robert J. Birgeneau; Pengcheng Dai; Ming Yi

doi:10.1103/physrevb.109.045416

Article Two-step electronic response to magnetic ordering in a van der Waals ferromagnet

Han Wu (Rice University) ; Jian-Xin Zhu (Los Alamos National Laboratory) ; Lebing Chen (University of California at Berkeley) ; Matthew W. Butcher (Rice University) ; Ziqin Yue (Rice University) ; Dongsheng Yuan (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Single Crystals Group, National Institute for Materials Science) ; Yu He (Yale University) ; Ji Seop Oh (Rice University) ; Bin Gao (Rice University) ; Jianwei Huang (Rice University) ; Shan Wu (University of California at Berkeley) ; Cheng Gong (University of Maryland, College Park) ; Yucheng Guo (Rice University) ; Sung-Kwan Mo (Lawrence Berkeley National Laboratory) ; Jonathan Denlinger (Lawrence Berkeley National Laboratory) ; Donghui Lu (SLAC National Accelerator Laboratory) ; Makoto Hashimoto (SLAC National Accelerator Laboratory) ; Matthew B. Stone (Oak Ridge National Laboratory (ORNL)) ; Alexander I. Kolesnikov (Oak Ridge National Laboratory (ORNL)) ; Songxue Chi (Oak Ridge National Laboratory (ORNL)) ; Junichiro Kono (Rice University) ; Andriy H. Nevidomskyy (Rice University) ; Robert J. Birgeneau (University of California at Berkeley) ; Pengcheng Dai (Rice University) ; Ming Yi (Rice University)

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Han Wu, Jian-Xin Zhu, Lebing Chen, Matthew W. Butcher, Ziqin Yue, Dongsheng Yuan, Yu He, Ji Seop Oh, Bin Gao, Jianwei Huang, Shan Wu, Cheng Gong, Yucheng Guo, Sung-Kwan Mo, Jonathan Denlinger, Donghui Lu, Makoto Hashimoto, Matthew B. Stone, Alexander I. Kolesnikov, Songxue Chi, Junichiro Kono, Andriy H. Nevidomskyy, Robert J. Birgeneau, Pengcheng Dai, Ming Yi. Two-step electronic response to magnetic ordering in a van der Waals ferromagnet. PHYSICAL REVIEW B. 2024, 109 (4), 045416. https://doi.org/10.1103/physrevb.109.045416

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The two-dimensional material Cr2⁢Ge2⁢Te6 is a member of the class of insulating van der Waals (vdW) magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te 𝑝-orbital-dominated bands to undergo changes at the Curie transition temperature 𝑇𝐶 while the Cr 𝑑-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets.

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