Phase transition observation in Weyl semimetal candidate Mn3Ga epitaxial thin films evidenced by transverse magnetoresistance
Hexagonal antiferromagnetic D019-Mn3X (X = Sn, Ge, Ga) compounds, with a non-collinear kagome spinstructure, exhibit novel topological transport properties such as colossal longitudinal magnetoresistance and itsevolution proportional to the E·B product. Here, we report on non-vanishing transverse ma...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/47949 |
| Acceso en línea: | https://hdl.handle.net/10578/47949 |
| Access Level: | acceso abierto |
| Palabra clave: | Mn3Ga Phase transitions Spin structures Tight-binding models Transverse magnetoresistances Weyl semimetal |
| Sumario: | Hexagonal antiferromagnetic D019-Mn3X (X = Sn, Ge, Ga) compounds, with a non-collinear kagome spinstructure, exhibit novel topological transport properties such as colossal longitudinal magnetoresistance and itsevolution proportional to the E·B product. Here, we report on non-vanishing transverse magnetoresistance ofstrained epitaxial GaN (0001)/Mn3Ga films with the magnetic field in the out-of-plane direction and the electricfield in the film plane along two perpendicular directions. Strain induces pseudo-electromagnetic fields favoringa chiral anomaly and therefore the observation of magnetoresistance. We found an evolution from negativelinear to positive quadratic magnetoresistance dependence on the magnetic field in the temperature range from150 to 300 K, along with a metallic to a narrow band gap semiconductor transition at a temperature of 230 K.First-principles calculations confirmed this transition, proposing a spin structure evolution, and by the implementationof a tight-binding model, based on the Fu-Kane-Mele model, the topological transport properties wereanalyzed confirming the experimental findings. |
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