POUDEL, Bishal; LACROIX, Claudine; ZWICKNAGL, Gertrud; BURDIN, Sébastien

doi:10.1088/1367-2630/ac06e8

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POUDEL, Bishal
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LACROIX, Claudine
Théorie de la Matière Condensée [NEEL - TMC]

ZWICKNAGL, Gertrud
Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig]

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Ce document a été publié dans

New Journal of Physics. 2021, vol. 23, p. 063073

Institute of Physics: Open Access Journals

Résumé en anglais

We study the Kondo alloy model on a square lattice using dynamical meanfield theory (DMFT) for Kondo substitution and disorder effects, together with static mean-field approximations. We computed and analyzed photoemission properties as a function of electronic filling nc , Kondo impurity concentration x, and strength of Kondo temperature TK. We provide a complete description of the Angle Resolved Photoemission Spectroscopy (ARPES) signals expected in the paramagnetic Kondo phases. By analyzing the Fermi surface, we observe the Liftshitz-like transition predicted previously for strong TK at x = nc and we discuss the evolution of the dispersion from the dense coherent to the dilute Kondo regimes. At smaller TK , we find that this transition marking the breakdown of coherence at x = nc becomes a crossover. However, we identify another transition at a smaller concentration x where the effective mass continuously vanishes. x separates the one-branch and the twobranches ARPES dispersions characterizing respectively dilute and dense Kondo paramagnetic regimes. The x − TK phase diagrams are also described, suggesting that the transition at x might be experimentally observable since magnetically ordered phases are stabilized at much lower TK. Fermi surface reconstructions in antiferromagnetic and ferromagnetic phases are also discussed.< Réduire

Mots clés en anglais

Liftshitz transition

angle resolved photoemission spectroscopy

coherence breakdown

disordered Kondo alloys

heavy-fermion

dynamical mean-field theory

phase transitions

DOI

http://dx.doi.org/10.1088/1367-2630/ac06e8

Project ANR

Topologie de surfaces de Fermi et émergence de nouveaux états électroniques dans des systèmes fortement corrélés - ANR-16-CE92-0018

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Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798