HDR de Yannick Klein - 10/01/25

Yannick Klein,  Maître de conférences dans l'équipe Design et étude de nouveaux matériaux à propriétés remarquables (DEMARE) soutient son Habilitation à Diriger des Recherches le vendredi 10 janvier 2025 à 14 h

IMPMC - Sorbonne Université - 4 place Jussieu - 75005 Paris - Barre 22-23, 4e étage, salle 401

Relationship between structural, magnetic and electronic properties in quasi-two dimensional transition metal sulphides

Abstract 

Transition metal sulphides (TMS) are expected to exhibit less electronic correlations than transition metal oxides. This is partly due to the less ionic character of sulphur as compared to oxygen. Nevertheless, there exist some exceptions among TMS in which electronic properties are governed by (moderate) renormalisation effects. I will present two bidimensional systems among these exceptions which I have been studying during the last 10 years at IMPMC. (i) First, I will show how the dichalcogenide VS2 can be chemically modified to control electronic correlations in the metallic CdI2-type layers, inducing long range magnetic orders, Kondo effect, and a non-Fermi liquid state. (ii) Then, I will focus on the Mott metal-insulator transition compound: Ba(Co,Ni)S2. The latter, exhibits long range magnetic order, topological properties and nematicity on top of electronic correlations which gives an extremely rich variety of physical properties to study.

Jury

• Pascale FOURY-LEYLEKIAN - Professeur, Université Paris-Saclay - LPS (Orsay) - Rapporteuse
• John Paul ATTFIELD- Professor, University of Edinburgh (United Kingdom) - Rapporteur
• Laurent CARIO - Directeur de recherche, CNRS - IMN (Nantes) - Rapporteur
• Ricardo LOBO - Directeur de recherche, CNRS - LPEM (Paris) - Examinateur
• Sylvie HEBERT - Directrice de recherche, CNRS - CRISMAT (Caen) - Examinatrice
• Christophe MARCENAT - Directeur de recherche, CEA - PHELIQS (Grenoble) - Examinateur

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