TY - JOUR
T1 - Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−xInxS2
AU - Guguchia, Z.
AU - Zhou, H.
AU - Wang, C. N.
AU - Yin, J. X.
AU - Mielke, C.
AU - Tsirkin, S. S.
AU - Belopolski, I.
AU - Zhang, S. S.
AU - Cochran, T. A.
AU - Neupert, T.
AU - Khasanov, R.
AU - Amato, A.
AU - Jia, S.
AU - Hasan, M. Z.
AU - Luetkens, H.
N1 - Funding Information:
The μSR experiments were carried out at the Swiss Muon Source (SμS) Paul Scherrer Insitute, Villigen, Switzerland. M.Z.H. acknowledges visiting scientist support from IQIM at the California Institute of Technology. Work at Princeton University was also supported by the Gordon and Betty Moore Foundation (GBMF4547 and GBMF9461; M.Z.H.). T.N. and S.S.T. acknowledge funding from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programm (ERC-STG-Neupert-757867-PARATOP). S.S.T. also acknowledges support from the Swiss National Science Foundation (grant number: PP00P2 176877). T.A.C. was supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1656466.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin-rotation, we explore magnetic correlations in the kagome magnet Co3Sn2−xInxS2 as a function of In-doping, providing putative evidence for an intriguing incommensurate helimagnetic (HM) state. Our results show that, while the undoped sample exhibits an out-of-plane ferromagnetic (FM) ground state, at 5% of In-doping the system enters a state in which FM and in-plane antiferromagnetic (AFM) phases coexist. At higher doping, a HM state emerges and becomes dominant at the critical doping level of only xcr,1 ≃ 0.3. This indicates a zero temperature first order quantum phase transition from the FM, through a mixed state, to a helical phase at xcr,1. In addition, at xcr,2 ≃ 1, a zero temperature second order phase transition from helical to paramagnetic phase is observed, evidencing a HM quantum critical point (QCP) in the phase diagram of the topological magnet Co3Sn2−xInxS2. The observed diversity of interactions in the magnetic kagome lattice drives non-monotonous variations of the topological Hall response of this system.
AB - The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin-rotation, we explore magnetic correlations in the kagome magnet Co3Sn2−xInxS2 as a function of In-doping, providing putative evidence for an intriguing incommensurate helimagnetic (HM) state. Our results show that, while the undoped sample exhibits an out-of-plane ferromagnetic (FM) ground state, at 5% of In-doping the system enters a state in which FM and in-plane antiferromagnetic (AFM) phases coexist. At higher doping, a HM state emerges and becomes dominant at the critical doping level of only xcr,1 ≃ 0.3. This indicates a zero temperature first order quantum phase transition from the FM, through a mixed state, to a helical phase at xcr,1. In addition, at xcr,2 ≃ 1, a zero temperature second order phase transition from helical to paramagnetic phase is observed, evidencing a HM quantum critical point (QCP) in the phase diagram of the topological magnet Co3Sn2−xInxS2. The observed diversity of interactions in the magnetic kagome lattice drives non-monotonous variations of the topological Hall response of this system.
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U2 - 10.1038/s41535-021-00352-3
DO - 10.1038/s41535-021-00352-3
M3 - Article
AN - SCOPUS:85106258960
SN - 2397-4648
VL - 6
JO - npj Quantum Materials
JF - npj Quantum Materials
IS - 1
M1 - 50
ER -