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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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• In Copyright
  

Keyword: Magnetic order, Electronic structure, Magnetic phase transitions, Van der Waals systems, Angle-resolved photoemission spectroscopy

Date published: 2024-01-12

Publisher: American Physical Society

Journal:

• PHYSICAL REVIEW B (ISSN: 24699950) vol. 109 issue. 4 045416

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4990

First published URL: https://doi.org/10.1103/physrevb.109.045416

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Updated at: 2024-11-19 16:30:44 +0900

Published on MDR: 2024-11-19 16:30:44 +0900