Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: f-Electron Systems and Heavy Fermions 2

TT 42.6: Vortrag

Mittwoch, 18. März 2020, 16:15–16:30, HSZ 204

Spectroscopic investigation of UFe2Si2, URu2Si2, UNi2Si2, and UPd2Si2: from Pauli paramagnetism to antiferromagnetism via the hidden order state.Andrea Amorese1,2, Martin Sundermann1,2, Andrea Marino2,3, Maurits Haverkort4, Liu Hao Tjeng2, and •Andrea Severing11University of Cologne, Germany — 2MPI-CPfS, Dresden, Germany — 3Politecnico di Milano, Milano, Italy — 4Heidelberg University, Heidelberg, Germany

We have carried out hard x-ray photoelectron spectroscopy (HAXPES) measurements at the U 4f core level and non-resonant inelastic x-ray scattering (NIXS) at the U O4,5 edge of UT2Si2 compounds that all form in the tetragonal ThCr2Si2 structure but exhibit different ground state properties: UFe2Si2 is a Pauli paramagnet; URu2Si2 is the famous hidden order compound of which the order parameter is still fiercely debated despite 30 years of intense experimental and theoretical studies [1]; UPd2Si2 and UNi2Si2 are antiferromagnets with TN well above 100 K and sizeable ordered magnetic moments. We have determined the degree of the 5f-electron localization (HAXPES) as well as the symmetry of the 5f ground state wave function (NIXS [2]) across these very different compounds. This enabled us to identify their systematics and to place them in an effective Doniach phase diagram.
Financial support of the DFG under grant SE-1441/5-1 is gratefully acknowledged.

[1] references in J.A. Mydosh and P.M. Oppeneer in Rev. Mod. Phys. 83, 1301 (2011) and in Phil. Magazine 94, 3642 (2014)

[2] M. Sundermann et al., PNAS 113, 13989 (2016)

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