Antiferromagnetic fluctuations and orbital-selective Mott transition in the van der Waals ferromagnet Fe3–xGeTe2

Bai, Xiaojian; Lechermann, Frank; Liu, Yaohua; Cheng, Yongqiang; Kolesnikov, Alexander I.; Ye, Feng; Williams, Travis J.; Chi, Songxue; Hong, Tao; Granroth, Garrett E.; May, Andrew F.; Calder, Stuart

doi:10.1103/physrevb.106.l180409

Antiferromagnetic fluctuations and orbital-selective Mott transition in the van der Waals ferromagnet Fe_3–xGeTe₂

Journal Article · Wed Nov 30 00:00:00 EST 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.l180409· OSTI ID:1971050

Bai, Xiaojian ^[1]; Lechermann, Frank ^[2]; ^[1]; ^[1]; ^[1]; ^[1]; ^[1]; ^[1]; Hong, Tao ^[1]; ^[1]; ^[1]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Hamburg (Germany)

Fe_3–xGeTe₂ is a layered magnetic van der Waals material of interest for both fundamental and applied research. Despite the observation of intriguing physical properties, open questions exist even on the basic features related to magnetism: is it a simple ferromagnet or are there antiferromagnetic regimes, and are the moments local or itinerant. In this work, we demonstrate that antiferromagnetic spin fluctuations coexist with the ferromagnetism through comprehensive elastic and inelastic neutron scattering and thermodynamic measurements. Our realistic dynamical mean-field theory calculations reveal that the competing magnetic fluctuations are driven by an orbital selective Mott transition (OSMT), where only the plane-perpendicular a_1g orbital of the Fe(3d) manifold remains itinerant. Our results highlight the multi-orbital character in Fe_3–xGeTe₂ that supports a rare coexistence of local and itinerant physics within this material.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Simons Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1971050

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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