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Center for Nonlinear Studies |
Long before quantum materials were dubbed, f-electron hybridization in Kondo lattices was recognized as a challenge to the theory of how electrons organize in f-electron systems. Today, our understanding remains incomplete, and one of the most prominent of these mysteries is that of the hidden order phase in the heavy fermion superconductor URu2Si2. I will discuss inelastic neutron scattering measurements and show that much of the magnetic fluctuation spectrum arises from interband transitions. The temperature- and momentum-dependence of these excitations are a natural result of the correlated paramagnetism that gives rise to the hidden order phase. I will discuss how the correlated state changes as a result of Fe substitution and the concomitant change to a magnetic ground state. Also, I will tie this to resonant inelastic x-ray scattering measurements that target more directly the electronic character of the correlated f-states.
Host: Marc Janoschek