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High Magnetic Field Investigations of Correlated Electron Quantum Materials


This dissertation goes over the results of high magnetic field and other measurements on various correlated electron quantum materials. These measurements include Shubnikov de Haas quantum oscillations measurements as a function of angle for PrT2Cd20 (T = Ni, Pd). Such measurements allow investigation of the heavy Fermion behavior in these systems as well as probing the shape of the Fermi surface. Other measurements include high field magnetostriction measurements of URu2-xFexSi2. URu2Si2 is a compound which exhibits a mysterious hidden order phase, and Fe doping has been shown to enhance this hidden order behavior. The magnetostriction measurements allow the further investigation of the associated high field, doped, phase diagram of this material, including indicating interesting phase transitions and also opens the possibility of investigating the development of the antiferromagnetic order in the compound. Lastly, SmB6 and FeSi are compared along various lines of measurement, including high field resistivity, resistivity under pressure, and Magnetic Field Modulated Microwave Spectroscopy (MFMMS). This comparison shows several similarities in the results of these measurements between these compounds, which are both suggested as possible topological Kondo insulators. However, there are also clear differences in the MFMMS result, suggesting the possibility that the surface physics of the compounds may be different.

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