Giant anomalous Hall effect in epitaxial Mn$_{3.2}$Ge films with a cubic kagome structure
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| author | McCoombs, J. S. R. MacNeil, B. D. Askarpour, V. Myra, J. Herdin, H. Pula, M. Robertson, M. D. Luke, G. M. Kavanagh, K. L. Maassen, J. Monchesky, T. L. |
| author_facet | McCoombs, J. S. R. MacNeil, B. D. Askarpour, V. Myra, J. Herdin, H. Pula, M. Robertson, M. D. Luke, G. M. Kavanagh, K. L. Maassen, J. Monchesky, T. L. |
| contents | We report on the first example of epitaxial Mn$_{3 + δ}$Ge thin films with a cubic $L1_2$ structure. The films are found to exhibit frustrated ferromagnetism with an average magnetization corresponding to 0.98$~\pm~$0.06$~μ_B$/Mn, far larger than the parasitic ferromagnetism in hexagonal Mn$_3$Ge and the partially compensated ferrimagnetism in tetragonal Mn$_3$Ge. The Hall conductivity is the largest reported for the kagome magnets with a low temperature value of $σ_{xy} = 1587~$S/cm. Density functional calculations predict that a chiral antiferromagnetic structure is lower in energy than a ferromagnetic configuration in an ordered stoichiometric crystal. However, chemical disorder driven by the excess Mn in our films explains why a frustrated 120$^\circ$ spin structure is not observed. Comparisons between the magnetization and the Hall resistivity indicate that a non-coplanar spin structure contributes the Hall signal. Anisotropic magnetoresistance and planar Hall effect with hysteresis up to 14 T provides further insights into this material. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_00683 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Giant anomalous Hall effect in epitaxial Mn$_{3.2}$Ge films with a cubic kagome structure McCoombs, J. S. R. MacNeil, B. D. Askarpour, V. Myra, J. Herdin, H. Pula, M. Robertson, M. D. Luke, G. M. Kavanagh, K. L. Maassen, J. Monchesky, T. L. Materials Science Strongly Correlated Electrons We report on the first example of epitaxial Mn$_{3 + δ}$Ge thin films with a cubic $L1_2$ structure. The films are found to exhibit frustrated ferromagnetism with an average magnetization corresponding to 0.98$~\pm~$0.06$~μ_B$/Mn, far larger than the parasitic ferromagnetism in hexagonal Mn$_3$Ge and the partially compensated ferrimagnetism in tetragonal Mn$_3$Ge. The Hall conductivity is the largest reported for the kagome magnets with a low temperature value of $σ_{xy} = 1587~$S/cm. Density functional calculations predict that a chiral antiferromagnetic structure is lower in energy than a ferromagnetic configuration in an ordered stoichiometric crystal. However, chemical disorder driven by the excess Mn in our films explains why a frustrated 120$^\circ$ spin structure is not observed. Comparisons between the magnetization and the Hall resistivity indicate that a non-coplanar spin structure contributes the Hall signal. Anisotropic magnetoresistance and planar Hall effect with hysteresis up to 14 T provides further insights into this material. |
| title | Giant anomalous Hall effect in epitaxial Mn$_{3.2}$Ge films with a cubic kagome structure |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2311.00683 |