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Absence of orbital rotation in superconducting CeCu2Ge2

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Deppe,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Haverkort,  M. W.
Maurits Haverkort, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Rueff, J.-P., Ablett, J. M., Strigari, F., Deppe, M., Haverkort, M. W., Tjeng, L. H., et al. (2015). Absence of orbital rotation in superconducting CeCu2Ge2. Physical Review B, 91(20): 201108, pp. 1-4. doi:10.1103/PhysRevB.91.201108.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-A4A8-3
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.