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- W4327625854 abstract "Abstract The discovery of topological insulators and semimetals triggered enormous interest in exploring emergent electromagnetic responses in solids. To explore multifunctional topological states, a particular attention has been focused on ternary half-Heusler compounds, whose electronic structure bears analogy to the topological zinc-blende compounds and which furthermore involve magnetic rare-earth ions coupled to conduction electrons [1, 2]. Most of them reported so far are band-inverted zero-gap semiconductors such as R PtBi [3-5] and R PdBi [6], which still do not fully exhaust the large potential of this materials class. Here, we report a less-studied member of half-Heusler compounds, HoAuSn, which is a trivial semimetal or narrow-gap semiconductor at zero magnetic field but revealed to undergo field-induced transition to a Weyl semimetal, accompanying huge negative magnetoresistance exceeding four orders of magnitude at low temperatures. The combined study of Shubnikov-de Haas oscillations and first-principles calculation suggests that the exchange field from Ho 4 f moments reconstructs the band structure to induce Weyl points which play a key role in the strong suppression of large-angle carrier scattering. Our findings demonstrate the unique mechanism of colossal negative magnetoresistance and provide pathways towards realizing topological electronic states in a large class of magnetic half-Heusler compounds." @default.
- W4327625854 created "2023-03-17" @default.
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- W4327625854 date "2023-03-16" @default.
- W4327625854 modified "2023-10-16" @default.
- W4327625854 title "Colossal negative magnetoresistance in field-induced Weyl semimetal of magnetic half-Heusler compound" @default.
- W4327625854 doi "https://doi.org/10.21203/rs.3.rs-2629156/v1" @default.
- W4327625854 hasPublicationYear "2023" @default.
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