Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1
TT 34.1: Talk
Wednesday, March 18, 2020, 09:30–09:45, HSZ 204
Crystal-field wave function of CeCu2Si2 across Tc and TK studied with linear polarized x-ray absorption — •andrea marino1,2, andrea amorese1, martin sundermann2,3, kai chen4, gertrud zwicknagl5, maurits haverkort6, frank steglich1, liu hao tjeng1, and andrea severing1,3 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Dipartimento di Fisica, Politecnico di Milano, Milano, Italy — 3Institute of Physics II, University of Cologne, Cologne, Germany — 4Helmholz Zentrum Berlin (HZB) BESSY, Berlin, Germany — 5Institute for Mathematical Physics, Technical University Braunschweig, Braunschweig, Germany — 6Institute for Theoretical Physics, Heidelberg University, Heidelberg, Germany
We have investigated the crystal-field wave functions of CeCu2Si2 in the temperature range between 250 mK and 300 K, i.e. from well below to well above the superconducting transition temperature Tc = 0.6 K and the Kondo temperature TK ≈ 10 K using Ce M4,5 x-ray absorption spectroscopy (XAS). The experiments in the mK regime were performed with the new mK insert at the DEIMOS beamline at synchrotron SOLEIL in France. The overall temperature dependence of the linear dichroism in the XAS is well explained with the thermal occupation of excited crystal-field states. Small deviations are discussed in terms of hybridization of f-electrons and conduction bands, supported by the temperature dependence of the f0 satellite in the isotropic XAS spectra.