Electronic correlations give rise to a plethora of interesting phenomena and phases. For example, hybridization between 4f and conduction electrons in heavy fermion metals may result in the generation of low-energy scales that can induce quantum criticality and unconventional superconductivity. One of the most important techniques that helped shaping our understanding of nonlocal correlations, both magnetic and superconducting, has been scanning tunneling spectroscopy (STS) with its unique ability to give local, microscopic information that directly relates to the one-particle Green's function. We combine STS with bulk measurements to obtain complementary information on different length scales. In particular, we focus on magnetotransport measurements, which e.g. may shed light on the impact of phase transitions, antiferromagnetic spin fluctuations or varying charge carrier concentrations on these phenomena.

Atomically resolved Si-terminated surface of YbRh2Si2, area 20 x 39 nm2

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