Shining light on the Kondo Lattice: An Angle Resolved photoemission study of heavy fermion formation in URu2Si2 and YbAl3
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Kondo lattices are a fascinating class of intermetallic compounds that contain certain rare earth elements such as Ce, Yb, U, and Eu, where the interaction between the localized \textit{f} electrons at the rare earth sites and the delocalized conduction sea leads to exciting emergent properties, such as unconventional superconductivity, quantum criticality, valence fluctuation etc. In this thesis, we describe how momentum-resolving capabilities of angle-resolved photoemission spectroscopy (ARPES), performed with high energy resolution at the milli-electron volt scale help disentangle subtle changes in electronic structure in these multi-band systems, thus providing important insights into the microscopic mechanisms at play. Ability to directly visualize how electrons organize themselves in these strongly correlated systems also help reveal important characteristics of these materials, often unexpected in conventional theories of the Kondo lattice.
We report ARPES experiments on single crystals of the actinide heavy fermion compound, URu
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Mueller, Erich