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Abstract:
We address the recently proposed orbital transition scenario in heavy
fermion compounds exhibiting two superconducting domes. Our method of
choice is nonresonant inelastic x-ray scattering (NIXS) which probes
charge densities and can be modeled quantitatively. Our NIXS results of
CeCu2Ge2, a model system of this class of materials, are well described
by considering the same sequence of orbitals at all temperatures, thus
putting into question whether orbital transitions are related to the
formation of the second superconducting dome. The discrepancy between
experimental findings and prediction could be due to the lack of
accuracy in the theoretical description of the 4f states.
