Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn$_{2}$As$_{2}$
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arXiv
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| Format: | Preprint |
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2024
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| author | Gen, Masaki Fujishiro, Yukako Okigami, Kazuki Hayami, Satoru Birch, Max T. Adachi, Kiyohiro Hashizume, Daisuke Kurumaji, Takashi Sagayama, Hajime Nakao, Hironori Tokura, Yoshinori Arima, Taka-hisa |
| author_facet | Gen, Masaki Fujishiro, Yukako Okigami, Kazuki Hayami, Satoru Birch, Max T. Adachi, Kiyohiro Hashizume, Daisuke Kurumaji, Takashi Sagayama, Hajime Nakao, Hironori Tokura, Yoshinori Arima, Taka-hisa |
| contents | Zintl phase EuIn$_{2}$As$_{2}$ has garnered growing attention as an axion insulator candidate, triggered by the identification of a commensurate double-${\mathbf Q}$ broken-helix state in previous studies, however, its periodicity and symmetry remain subjects of debate. Here, we perform resonant x-ray scattering experiments on EuIn$_{2}$As$_{2}$, revealing an incommensurate nature of the broken-helix state, where both the wave number and the amplitude of the helical modulation exhibit systematic sample dependence. Furthermore, the application of an in-plane magnetic field brings about a fanlike state that appears to preserve the double-${\mathbf Q}$ nature, which might be attributed to multiple-spin interactions in momentum space. We propose that the itinerant character of EuIn$_{2}$As$_{2}$, most likely induced by Eu deficiency, gives rise to the helical modulation and impedes the realization of a theoretically-predicted axion state with the collinear antiferromagnetic order. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_03022 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn$_{2}$As$_{2}$ Gen, Masaki Fujishiro, Yukako Okigami, Kazuki Hayami, Satoru Birch, Max T. Adachi, Kiyohiro Hashizume, Daisuke Kurumaji, Takashi Sagayama, Hajime Nakao, Hironori Tokura, Yoshinori Arima, Taka-hisa Strongly Correlated Electrons Zintl phase EuIn$_{2}$As$_{2}$ has garnered growing attention as an axion insulator candidate, triggered by the identification of a commensurate double-${\mathbf Q}$ broken-helix state in previous studies, however, its periodicity and symmetry remain subjects of debate. Here, we perform resonant x-ray scattering experiments on EuIn$_{2}$As$_{2}$, revealing an incommensurate nature of the broken-helix state, where both the wave number and the amplitude of the helical modulation exhibit systematic sample dependence. Furthermore, the application of an in-plane magnetic field brings about a fanlike state that appears to preserve the double-${\mathbf Q}$ nature, which might be attributed to multiple-spin interactions in momentum space. We propose that the itinerant character of EuIn$_{2}$As$_{2}$, most likely induced by Eu deficiency, gives rise to the helical modulation and impedes the realization of a theoretically-predicted axion state with the collinear antiferromagnetic order. |
| title | Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn$_{2}$As$_{2}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.03022 |