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Suppression of local magnetic moment formation and paramagnetic exchange interactions in monolayer Fe3GeTe2

A. A. Katanin1,2, A. N. Rudenko3, D. I. Badrtdinov3, and M. I. Katsnelson3

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Phys. Rev. B 114, 165119 – Published 14 September, 2026

DOI: https://doi.org/10.1103/h8ws-g38m

Abstract

We study the electronic and magnetic properties of monolayer Fe3GeTe2 within the density-functional plus dynamical mean-field theory approach in the paramagnetic phase. We argue that this compound is sufficiently far from the local magnetic moment limit, demonstrating nonlinear temperature dependencies of the partial inverse local and uniform magnetic susceptibilities in a broad temperature range. We find that in the regime of moderate Coulomb interactions (U=3–4eV), the iron atoms located above and below the Ge plane carry a substantial local magnetic moment (μ≳4.5μB), while the iron atom located within the Ge plane does not exhibit any pronounced magnetic moment. At the same time, the exchange interaction between these two symmetry-nonequivalent types of atoms turns out to be crucial for stabilizing long-range ferromagnetic order in Fe3GeTe2. The estimated spin-wave stiffness and Curie temperature are in good agreement with the experimental data, indicating that a dynamical treatment of electron correlations in Fe3GeTe2 is essential to properly describe its partially itinerant magnetic behavior.

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Phys. Rev. B 114, 165119– Published 14 September, 2026
  • Received 18 March 2026
  • Revised 26 July 2026
  • Accepted 18 August 2026
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