Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M51: Dirac and Weyl Semimetals: Materials and Modeling--Magnetic Weyl Semimetals
11:30 AM–2:30 PM,
Wednesday, March 17, 2021
Sponsoring
Units:
DMP DCMP GMAG
Chair: Joseph Checkelsky, Massachusetts Institute of Technology MIT
Abstract: M51.00003 : Tunable Berry Curvature Effects Through Volume-wise Magnetic Competition in a Topological Kagome Magnet Co3Sn2S2
12:18 PM–12:30 PM
Live
Presenter:
Zurab Guguchia
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Authors:
Zurab Guguchia
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Joel Verezhak
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Dariusz Gawryluk
(Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute)
Stepan Tsirkin
(Department of Physics, University of Zurich)
Jiaxin Yin
(Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University)
Ilya Belopolski
(Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University)
Huibin Zhou
(International Center for Quantum Materials, Peking University)
Gediminas Simutis
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Songtian Zhang
(Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University)
Tyler Cochran
(Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University)
Guoqing Chang
(Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University)
Ekaterina Pomjakushina
(Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute)
Lukas Keller
(Laboratory for Neutron Scattering, Paul Scherrer Institute)
Zuzanna Skrzeczkowska
(Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute)
Qi Wang
(Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China)
Hechang Lei
(International Center for Quantum Materials, Peking University)
Rustem Khasanov
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Alex Amato
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Shuang Jia
(International Center for Quantum Materials, Peking University)
Titus Neupert
(Department of Physics, University of Zurich)
Hubertus Luetkens
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Zahid Hasan
(Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University)
kagome magnets have appeared as the most promising platforms. Here, we explore magnetic correlations in the kagome magnet Co3Sn2S2. Using muon spin-rotation, we present evidence for competing magnetic orders in the kagome lattice of this compound. Our results show that while the sample exhibits an out-of-plane ferromagnetic ground state, an in-plane antiferromagnetic state appears at temperatures above 90 K, eventually attaining a volume fraction of 80% around 170 K, before reaching a non-magnetic state [1]. Strikingly, the reduction of the anomalous Hall conductivity above 90 K linearly follows the disappearance of the volume fraction of the ferromagnetic state. We further show that the competition of these magnetic phases is tunable through applying either an external magnetic field or hydrostatic pressure. Our results taken together suggest the thermal and quantum tuning of Berry curvature field via external tuning of magnetic order. Our study shows that
Co3Sn2S2 is a rare example where the magnetic competition drives the thermodynamic evolution of the Berry curvature, thus tuning its topological state.
[1] Guguchia et. al., Nat. Comm. 11, 559 (2020).
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