Tristan Cren

Tristan Cren

Affiliation: CNRS & Sorbonne University

Research Interests: Superconductivity, strongly correlated material, topological materials

Title: Misfit compounds as a platform for engineering doping, charge density waves and Ising superconductivity

Abstract: In the current quest of superconducting materials which combine two-dimensionality and strong spin-orbit coupling, transition metal dichalcogenides (TMD) misfit materials appear as extremely promising. They are constituted by sandwiching rocksalt layers, such as LaSe, and TMD layers, such as NbSe₂. Misfits are a new platform that allows achieving unprecedented high doping levels in TMD materials [1, 2]. We will show how we have succeeded adjusting finely the chemical potential over a very wide range in NbSe₂ using a Pb_xLa_1−x rocksalt, and how this can be used for stabilizing several charge density waves orders (2 × 2, 3 × 3) and tuning the superconducting transition temperature over a wide range [2]. Superconductivity in these compounds exhibits a huge in-plane critical field which is much higher than the paramagnetic limit [3, 4, 5] due to a very strong Ising spin-orbit coupling. We will show some hint of non-conventional pairing in misfit compounds.