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

Abstract

The two-dimensional (2D) material Cr${}_2$Ge${}_2$Te${}_6$ is a member of the class of insulating van der Waals 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 T${}_C$ 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.

PRB, in press

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Cited by in corpus (4)

• Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe${}_3$GaTe${}_2$ and Fe${}_3$GeTe${}_2$
• Unusual ferromagnetic band evolution and high Curie temperature in monolayer 1T-CrTe2 on bilayer graphene
• Dichotomy of flat bands in the van der Waals ferromagnet Fe${}_5$GeTe${}_2$
• Probing of magnetic dimensional crossover in CrSiTe${}_3$ through picosecond strain pulses