Sub-10 nm helices stabilized by single-ion anisotropy in the chiral Mott insulator Co$_5$TeO$_8$
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912770740453376 |
|---|---|
| author | Baral, Priya R. Yadav, Ravi Ukleev, Victor LaGrange, Thomas Živković, Ivica Bi, Wen Hua Bartkowiak, Marek Cubitt, Robert Steinke, Nina-Juliane Pomjakushin, Vladimir Skourski, Yurii Rønnow, Henrik M. Yazyev, Oleg V. Magrez, Arnaud White, Jonathan S. |
| author_facet | Baral, Priya R. Yadav, Ravi Ukleev, Victor LaGrange, Thomas Živković, Ivica Bi, Wen Hua Bartkowiak, Marek Cubitt, Robert Steinke, Nina-Juliane Pomjakushin, Vladimir Skourski, Yurii Rønnow, Henrik M. Yazyev, Oleg V. Magrez, Arnaud White, Jonathan S. |
| contents | Narrow-gap Mott insulators promise exceptional opportunities for voltage-controlled magnetic textures in low-dissipation spintronics, although their prediction remains challenging. Here we employ a density functional theory-guided approach to predict a narrow charge-transfer gap (127 meV) in the chiral cubic frustrated oxide Co$_5$TeO$_8$. Comprehensive neutron scattering and magnetometry reveal proper-screw Bloch-type helices with field- and temperature-tunable pitch of 5.7-10 nm embedded in a complex phase diagram with eight distinct phases. Ab initio wavefunction calculations demonstrate site-dependent single-ion anisotropy exceeding Dzyaloshinskii-Moriya (DM) interactions by an order of magnitude, establishing the anisotropy-frustration interplay as the stabilization mechanism, contrasting starkly with DM-dominated cubic helimagnets. Sharp capacitance anomalies at phase boundaries confirm intrinsic magnetoelectric coupling throughout the phase diagram. Co$_5$TeO$_8$ thus provides a platform for voltage-tunable sub-10 nm magnetic textures, demonstrating effective theory-guided discovery of functional magnetic materials in correlated oxides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_15147 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sub-10 nm helices stabilized by single-ion anisotropy in the chiral Mott insulator Co$_5$TeO$_8$ Baral, Priya R. Yadav, Ravi Ukleev, Victor LaGrange, Thomas Živković, Ivica Bi, Wen Hua Bartkowiak, Marek Cubitt, Robert Steinke, Nina-Juliane Pomjakushin, Vladimir Skourski, Yurii Rønnow, Henrik M. Yazyev, Oleg V. Magrez, Arnaud White, Jonathan S. Strongly Correlated Electrons Narrow-gap Mott insulators promise exceptional opportunities for voltage-controlled magnetic textures in low-dissipation spintronics, although their prediction remains challenging. Here we employ a density functional theory-guided approach to predict a narrow charge-transfer gap (127 meV) in the chiral cubic frustrated oxide Co$_5$TeO$_8$. Comprehensive neutron scattering and magnetometry reveal proper-screw Bloch-type helices with field- and temperature-tunable pitch of 5.7-10 nm embedded in a complex phase diagram with eight distinct phases. Ab initio wavefunction calculations demonstrate site-dependent single-ion anisotropy exceeding Dzyaloshinskii-Moriya (DM) interactions by an order of magnitude, establishing the anisotropy-frustration interplay as the stabilization mechanism, contrasting starkly with DM-dominated cubic helimagnets. Sharp capacitance anomalies at phase boundaries confirm intrinsic magnetoelectric coupling throughout the phase diagram. Co$_5$TeO$_8$ thus provides a platform for voltage-tunable sub-10 nm magnetic textures, demonstrating effective theory-guided discovery of functional magnetic materials in correlated oxides. |
| title | Sub-10 nm helices stabilized by single-ion anisotropy in the chiral Mott insulator Co$_5$TeO$_8$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.15147 |