Studies of the Interplay of Magnetic and Electronic Phenomena in Kagome Lattices and Other Systems
| dc.contributor.advisor | Dai, Pengcheng | en_US |
| dc.creator | Neubauer, Kelly J. | en_US |
| dc.date.accessioned | 2024-05-21T21:02:14Z | en_US |
| dc.date.created | 2024-05 | en_US |
| dc.date.issued | 2024-04-10 | en_US |
| dc.date.submitted | May 2024 | en_US |
| dc.date.updated | 2024-05-21T21:02:14Z | en_US |
| dc.description | EMBARGO NOTE: This item is embargoed until 2026-05-01 | en_US |
| dc.description.abstract | Novel magnetic materials form a vibrant research field investigating the interplay between topology, magnetism, and electronic correlation. The crystal geometry and magnetic state of a material can significantly influence the emergent electronic properties. For example, the kagome lattice has natural geometric frustration known to host flat electronic bands, non-trivial topological properties, and unusual spin textures. This dissertation reports studies of magnetic materials, including several kagome systems, that exhibit interesting electronic responses, including large anomalous and topological Hall effects and magnetoresistances. The electronic phenomena were studied via magneto-transport measurements. The magnetic phenomena were studied via neutron scattering measurements, which can directly probe spin structures and dynamics. First, this dissertation describes the large, anisotropic magnetoresistance observed in BaFe2As2. It was determined that this effect could not be described by only the anisotropic Fermi surface but must consider the field-dependent magnetic structure. Second, the neutron scattering studies of the kagome lattice material YMn6Sn6 are described. Skyrmions, the typical signature of the topological Hall effect, were absent in YMn6Sn6. Instead, YMn6Sn6 was one of the first examples of a material that hosts a non-coplanar spin texture that provides the non-zero spin chirality to support the effect without requiring skyrmions. Next, this dissertation presents the doping dependence of the magnetism and electronic behavior of another kagome lattice material, Co3Sn2-xInxS2. In this study, neutron scattering was used to determine the spin dynamics and structures, which indicated upon In doping that the ferromagnetic spin structure cants to form a noncollinear spin structure. Such a spin texture could induce non-zero Berry curvature and support an additional contribution to the anomalous Hall response. Finally, this dissertation details a study of the kagome B35 phase of FeGe. Previous studies observed an enhanced anomalous Hall effect below the canting temperature. The neutron scattering measurements in this thesis ruled out skyrmions or defects as the mechanism for the effect. They also provided an understanding of the magnetic order in the spin-flop phase. Overall, this dissertation contributes to a deeper understanding of the interplay between non-trivial magnetism and electronic behavior and supports the potential of novel magnetic materials in spintronics applications. | en_US |
| dc.embargo.lift | 2026-05-01 | en_US |
| dc.embargo.terms | 2026-05-01 | en_US |
| dc.format.mimetype | application/pdf | en_US |
| dc.identifier.citation | Neubauer, Kelly. Studies of the Interplay of Magnetic and Electronic Phenomena in Kagome Lattices and Other Systems. (2024). PhD diss., Rice University. https://hdl.handle.net/1911/116086 | en_US |
| dc.identifier.uri | https://hdl.handle.net/1911/116086 | en_US |
| dc.language.iso | eng | en_US |
| dc.rights | Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder. | en_US |
| dc.subject | neutron scattering | en_US |
| dc.subject | magnetism | en_US |
| dc.title | Studies of the Interplay of Magnetic and Electronic Phenomena in Kagome Lattices and Other Systems | en_US |
| dc.type | Thesis | en_US |
| dc.type.material | Text | en_US |
| thesis.degree.department | Physics and Astronomy | en_US |
| thesis.degree.discipline | Natural Sciences | en_US |
| thesis.degree.grantor | Rice University | en_US |
| thesis.degree.level | Doctoral | en_US |
| thesis.degree.name | Doctor of Philosophy | en_US |