Intrinsic insulating transport characteristics in low-carrier density EuCd2As2 films
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866909072741105664 |
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| author | Nishihaya, Shinichi Nakamura, Ayano Ohno, Mizuki Kriener, Markus Watanabe, Yuto Kawasaki, Masashi Uchida, Masaki |
| author_facet | Nishihaya, Shinichi Nakamura, Ayano Ohno, Mizuki Kriener, Markus Watanabe, Yuto Kawasaki, Masashi Uchida, Masaki |
| contents | Searching for an ideal magnetic Weyl semimetal hosting only a single pair of Weyl points has been a focal point for systematic clarification of its unique magnetotransport derived from the interplay between topology and magnetization. Among the candidates, triangular-lattice antiferromagnet EuCd$_2$As$_2$ has been attracting special attention due to the prediction of the ideal Weyl semimetal phase in the ferromagnetic state, however, transport properties of low-carrier density samples have remained elusive. Here we report molecular beam epitaxy growth of EuCd$_2$As$_2$ films, achieving low-hole density in the range of $10^{15}$-$10^{16}$ cm$^{-3}$ at low temperature. Transport measurements of such low-carrier density films reveal an insulating behavior with an activation gap of about 200 meV, which persists even in the field-induced ferromagnetic state. Our work provides an important experimental clue that EuCd$_2$As$_2$ is intrinsically insulating, contrary to the previous prediction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_02026 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Intrinsic insulating transport characteristics in low-carrier density EuCd2As2 films Nishihaya, Shinichi Nakamura, Ayano Ohno, Mizuki Kriener, Markus Watanabe, Yuto Kawasaki, Masashi Uchida, Masaki Materials Science Strongly Correlated Electrons Searching for an ideal magnetic Weyl semimetal hosting only a single pair of Weyl points has been a focal point for systematic clarification of its unique magnetotransport derived from the interplay between topology and magnetization. Among the candidates, triangular-lattice antiferromagnet EuCd$_2$As$_2$ has been attracting special attention due to the prediction of the ideal Weyl semimetal phase in the ferromagnetic state, however, transport properties of low-carrier density samples have remained elusive. Here we report molecular beam epitaxy growth of EuCd$_2$As$_2$ films, achieving low-hole density in the range of $10^{15}$-$10^{16}$ cm$^{-3}$ at low temperature. Transport measurements of such low-carrier density films reveal an insulating behavior with an activation gap of about 200 meV, which persists even in the field-induced ferromagnetic state. Our work provides an important experimental clue that EuCd$_2$As$_2$ is intrinsically insulating, contrary to the previous prediction. |
| title | Intrinsic insulating transport characteristics in low-carrier density EuCd2As2 films |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2401.02026 |