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TT: Fachverband Tiefe Temperaturen

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

TT 42.5: Vortrag

Mittwoch, 18. März 2020, 16:00–16:15, HSZ 204

Partially Localized Phases in 5f Systems — •Bishal Poudel1,2, Sébastien Burdin1, and Gertrud Zwicknagl21LOMA UMR 5798, Université de Bordeaux, 33400, Talence, France — 2Institut für Mathematische Physik, TU Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany

We study a generalized multi-orbital Hubbard Hamiltonian as an effective model for 5f electrons in actinide compounds. Our model assumes a large spin-orbit interaction, and includes local correlations. In our model, we use jj-scheme to classify the electronic states and due to large spin-orbit interaction the multiplet states with j = 7/2 or higher are neglected.

Here, we generalize the previous calculations [1-3] performed for 5f electrons systems using a rotationally invariant slave boson method [4] within a mean-field approximation. We analyze the phase diagram of the system at zero temperature. Varying the strength and anisotropy of the effective non-interacting electronic bandwidths, we analyze the partial -orbitally selective- localization of f electrons as well as their magnetic ordering.

[1] G. Zwicknagl, and P. Fulde, J. Phys. Condens. Matter 15, S1911 (2003).

[2] D. V. Efremov, N. Hasselmann, E. Runge, P. Fulde, and G. Zwicknagl, Phys. Rev. B 69, 115114 (2004).

[3] F. Pollmann, and G. Zwicknagl, Phys. Rev. B 73, 035121 (2006).

[4] F. Lechermann, A. Georges, G. Kotliar, and O. Parcollet, Phys. Rev. B 76, 155102 (2007)

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