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Tunable Berry Curvature Effects Through Volume-wise Magnetic Competition in a Topological Kagome Magnet Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>

ORAL

Abstract

Magnetic topological phases of quantum matter are an emerging frontier in physics and material science. Along these lines, several
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., arXiv:1904.09353 (2019).

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Presenters

  • Zurab Guguchia

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland, Paul Scherrer Institut, Paul-Scherrer-Institut, Villigen, Switzerland, Paul Scherrer Institute

Authors

  • Zurab Guguchia

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland, Paul Scherrer Institut, Paul-Scherrer-Institut, Villigen, Switzerland, Paul Scherrer Institute

  • Joel Verezhak

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland

  • Dariusz Gawryluk

    Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, PSI, Paul Scherrer Institute

  • Stepan Tsirkin

    Department of Physics, University of Zurich, Univ of Zurich

  • Jiaxin Yin

    Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton University, Physics, Princeton University

  • Ilya Belopolski

    Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton University

  • Huibin Zhou

    Peking University, International Center for Quantum Materials, Peking Univ, Department of physics, ICQM, Peking University

  • Gediminas Simutis

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland

  • Songtian Zhang

    Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton University

  • Tyler Cochran

    Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton University, Physics, Princeton University

  • Guoqing Chang

    Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton University

  • Ekaterina Pomjakushina

    Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, PSI

  • Lukas Keller

    Laboratory for Neutron Scattering, Paul Scherrer Institute

  • Zuzanna Skrzeczkowska

    Faculty of Chemistry, Warsaw University of Technology

  • Qi Wang

    Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China

  • Hechang Lei

    Brookhaven National Laboratory, Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Renmin University of China

  • Rustem Khasanov

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland, Paul Scherrer Institut

  • Alex Amato

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland

  • Shuang Jia

    Peking University, International Center for Quantum Materials, Peking Univ, School of Physics, Peking University, Peking University, Department of physics, ICQM, Peking University

  • Titus Neupert

    Univ of Zurich, University of Zurich, Department of Physics, University of Zurich, Physics, University of Zurich

  • Hubertus Luetkens

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland, Paul-Scherrer-Institut, Villigen, Switzerland

  • Zahid Hasan

    Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton University, Physics, Princeton University