Misfit compounds as a platform for engineering doping, charge density waves and Ising superconductivity
e-mail: hasegawa@issp.u-tokyo.ac.jpLanguage in Speech : English
Please register from here
https://hasegawa.issp.u-tokyo.ac.jp/nanosci-seminar-250818
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. TMD 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 PbxLa1-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.
References:
[1] Raphaël T. Leriche et al., Advanced Functional Materials 31, 2007706 (2021)
[2] L. Zullo, G. Marini, T. Cren, M. Calandra, Nano Letters 23, 6658 (2023)
[3] P. Samuely et al., Physical Review B 104, 224507 (2021)
[4] T. Samuely et al., Physical Review B 108, L220501 (2023)
[5] L. Engström, L. Zullo, T. Cren, A. Mesaros, P. Simon, arXiv:2504.20775 (2025)