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  Consecutive topological phase transitions and colossal magnetoresistance in a magnetic topological semimetal

Du, F., Yang, L., Nie, Z., Wu, N., Li, Y., Luo, S., et al. (2022). Consecutive topological phase transitions and colossal magnetoresistance in a magnetic topological semimetal. npj Quantum Materials, 7(1): 65, pp. 1-7. doi:10.1038/s41535-022-00468-0.

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 Creators:
Du, Feng1, Author
Yang, Lin1, Author
Nie, Zhiyong1, Author
Wu, Ninghua1, Author
Li, Yong1, Author
Luo, Shuaishuai1, Author
Chen, Ye1, Author
Su, Dajun1, Author
Smidman, Michael1, Author
Shi, Youguo1, Author
Cao, Chao1, Author
Steglich, Frank2, Author           
Song, Yu1, Author
Yuan, Huiqiu1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: The combination of magnetic symmetries and electronic band topology provides a promising route for realizing topologically nontrivial quasiparticles, and the manipulation of magnetic structures may enable the switching between topological phases, with the potential for achieving functional physical properties. Here, we report measurements of the electrical resistivity of EuCd2As2 under pressure, which show an intriguing insulating dome at pressures between p(c1) similar to 1.0 GPa and p(c2) similar to 2.0 GPa, situated between two regimes with metallic transport. The insulating state can be fully suppressed by a small magnetic field, leading to a colossal negative magnetoresistance on the order of 10(5)%, accessible via a modest field of similar to 0.2 T. First-principles calculations reveal that the dramatic evolution of the resistivity under pressure can be attributed to consecutive transitions of EuCd2As2 from a magnetic topological insulator to a trivial insulator, and then to a Weyl semimetal, with the latter resulting from a pressure-induced change in the magnetic ground state. Similarly, the colossal magnetoresistance results from a field-induced polarization of the magnetic moments, transforming EuCd2As2 from a trivial insulator to a Weyl semimetal. These findings underscore weak exchange couplings and weak magnetic anisotropy as ingredients for discovering tunable magnetic topological materials with desirable functionalities.

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Language(s): eng - English
 Dates: 2022-06-162022-06-16
 Publication Status: Published in print
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 7 (1) Sequence Number: 65 Start / End Page: 1 - 7 Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648