26–30 Aug 2019
Universität Zürich
Europe/Zurich timezone

【607】Tunable Berry Curvature Through Magnetic Phase Competition in a Topological Kagome Magnet

27 Aug 2019, 15:45
15m
G 85

G 85

Talk MaNEP Session: Correlations and topology in quantum matter MaNEP: Correlations and topology in quantum matter

Speaker

Zurab Guguchia (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)

Description

Using muon spin-rotation experiments and density functional theory calculations, we present evidence for competing magnetic orders in a topological kagome magnet Co$_3$Sn$_2$S$_2$ [1]. 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. 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 that the magnetic competition drives the thermal and quantum evolution of Berry curvature field in Co$_3$Sn$_2$S$_2$, thus tuning its topological state.

[1]Guguchia et.al., arXiv:1904.09353(2019).

Authors

Zurab Guguchia (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Joel Verezhak (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Dariusz Gawryluk (Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland) Dr Stepan S Tsirkin (Department of Physics, University of Zurich, Winterthurerstrasse 190, Zurich, Switzerland) Dr Jiaxin Yin (2Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA) Dr Ilya Belopolski (2Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA) Mr Huibin Zhou (International Center for Quantum Materials and School of Physics, Peking University, Beijing, China) Dr Gediminas Simutis (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Mrs Songtian Zhang (Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA) Mr Tyler A Cochran (Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA) Dr Guoqing Chang (Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA) Dr Ekaterina Pomjakushina (Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland) Dr Lukas Keller (Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland) Mrs Zuzanna Skrzeczkowska (8Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland) Mr Qiang Wang (Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing, China) Prof. Lei Hechang C (Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing, China) Dr Rustem Khasanov (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Alex Amato (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Prof. Shuang Jia (International Center for Quantum Materials and School of Physics, Peking University, Beijing, China) Prof. Titus Neupert (Department of Physics, University of Z¨urich, Winterthurerstrasse 190, Zurich, Switzerland) Dr Hubertus Luetkens (1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Prof. Zahid M Hasan (Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA)

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