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Defects have proven to be invaluable microscopic probes for exploring complex properties
of strongly correlated electron systems. Recent breakthroughs in scanning tunneling
spectroscopy (STS) in heavy-fermion materials have opened the possibility for utilizing
defects also in this class of materials.
In this talk, I demonstrate that defects can provide important insight into the electronic and magnetic structure of heavy-fermion materials. In particular, I show that defects lead to oscillations in the electronic hybridization and magnetic correlations, which possess different spatial signatures, thus allowing one to discriminate between them in real space. These spatial perturbations possess spectroscopic signatures, such as in the differential conductance, dI/dV, measured by STS, and thus are experimentally accessible. Moreover, I discuss that effects of different types of defects, such as the formation of bound states. Finally, I show that the predicted spatial hybridization waves and bound states have recently been observed in STS experiments by Hamidian et al. on URua2Si2. |
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