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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: f-Electron Systems and Heavy Fermions II

TT 9.8: Vortrag

Montag, 27. März 2023, 16:45–17:00, HSZ 201

Orbital-selective Mott transition and heavy-fermion physics in the van der Waals ferromagnet Fe3−xGeTe2 — •Frank Lechermann1, Xiaojian Bai2, Yaohua Liu2, Yongqiang Cheng2, Alexander I. Kolesnikov2, Feng Ye2, Travis J. Williams2, Songxue Chi2, Tao Hong2, Garrett E. Granroth2, Andrew F. May3, and Stuart Calder21Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA — 3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

The van der Waals ferromagnet Fe3−xGeTe2 is a fascinating material that attracts combined strong interest from magnetoelectronics as well as from strong correlation physics. While near room temperature, the possibilities to exfoliate conducting ferromagnetic layers is investigated, at temperatures below T∼ 100 K the system displays surprising signatures of heavy-fermion physics. By means of first-principles many-body calculations, we here show that the latter temperature regime is governed by a rare orbital-selective Mott phase. This leads to emergent Kondo(-lattice) behavior in an unique transition-metal 3d compound, accompanied by antiferromagnetic fluctuations within the ferromagnetic phase. These fluctuations are experimentally revealed by neutron scattering.

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