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- W495434 abstract "This thesis presents experimental investigations of magnetically frustrated materials. Thefirst part describes an investigation of the zero-point entropy of spin glasses. Heat capacitymeasurements on the insulating spin glass series ZnxCu1−xAl2O4 were conducted, and theirzero-point entropies were found to agree well with the predicted value for the Tanaka andEdwards model of a Sherrington–Kirkpatrick XY spin glass, confirming that this model isapplicable to real systems.The majority of the thesis focuses on structural, magnetic and electron transport studieson members of the metallic Fe–Sn family. Powder neutron diffraction showed that FeSn andFe3Sn, with crystal structures based on single kagome layers, are simple collinear antiferroandferromagnets respectively. In contrast, the kagome bilayer based Fe3Sn2 was found tobe a rare example of a non-collinear, frustrated ferromagnet (TC ≈ 640 K). The complexityof the magnetic interactions in this material was further demonstrated by the emergenceof a re-entrant spin glass phase at low temperature (Tf ≈ 80 K), as evidenced by magneticsusceptibility and thermoremanent magnetisation measurements.The magnetic moments in frustrated Fe3Sn2 were found to rotate towards the basal planeupon cooling. This rotation may be the cause of the temperature dependent muon spindepolarisation rate seen in μSR measurements, in addition to the evolution of the complexmagnetic surface domain pattern, as illustrated by magnetic force microscopy. Furthermore,the non-collinearity of the moments could be the origin of the unusual anomalous Hall effect(AHE) observed in this material. Measurements show that Fe3Sn2 has a large saturated Hallresistivity (3.18 ± 0.02 μΩcm) at room temperature, and indicate that the AHE cannot beascribed to any of the conventional intrinsic mechanisms. These findings highlight thepotential of Fe3Sn2 for AHE based applications, and its importance for future investigationof the relationship between non-collinearity and the AHE." @default.
- W495434 created "2016-06-24" @default.
- W495434 creator A5081567662 @default.
- W495434 date "2011-12-28" @default.
- W495434 modified "2023-09-27" @default.
- W495434 title "Magnetic frustration in insulators and conductors" @default.
- W495434 hasPublicationYear "2011" @default.
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