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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: f-Electron Systems and Heavy Fermions II

TT 9.7: Vortrag

Montag, 27. März 2023, 16:30–16:45, HSZ 201

Evolution of the 4f states in TmSe1−xTex from semimetals to semiconductors — •Chul Hee Min1, Simon Müller2, Michael Heber3, Lenart Dudy4, Hendrik Bentmann3, Matthias Kalläne1, Markus Scholz3, Woojae Choi5, Yong Seung Kwon5, Friedrich Reinert2, and Kai Rossnagel1,31IEAP, CAU Kiel, Germany — 2EP7 and ct.qmat, University of Würzburg, Germany — 3DESY, Hamburg, Germany — 4Synchrotron SOLEIL, Saint-Aubin, France — 5Dep. of EMS, DGIST, South Korea

Localized 4f states are often considered to become coherent states at low temperatures by hybridizing with itinerant conduction 5d states. In the standard Anderson model, only one type of interaction between the two states is taken into account, which is sufficient to describe Kondo physics. However, additional interaction has been suggested for the mixed valence regime to satisfy the Friedel sum rule when two charge states exist on a short time scale [1]. Here we present photoemission results of mixed-valent Thulium monochalcogenide TmSe1−xTex. This system allows us to study the evolution of the localized 4f states between semimetallic and semiconducting phases without applying external pressure and disturbing the periodicity of Tm ions. Our results show two different interactions between 4f and 5d states across the phase transition.

[1] F. Haldane, Phys. Rev. B 15, 2477 (1976)

C. Varma, Phys. Rev. B 102, 155145 (2022)

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