Seminar By Xiaoling (Cocoa) Wang, California State University East Bay

Title: Untangling the unconventional coupling between charge density wave order and superconductivity in kagome superconductors

Host: Arneil Reyes, CMS - DC Field

Abstract: The investigation of the interplay between superconductivity and other ordered states, such as charge density wave (CDW) state, constitutes a fundamental aspect of condensed matter physics. The discovery of the layered kagome metal AV₃Sb₅ (A=K, Rb, Cs) offers a new experimental platform for exploring this competition.

AV₃Sb₅ lattices exhibit both a non-conventional CDW order (TCDW ∼ 80 − 104 K) and a topological superconducting ground state (TC ∼ 0.9 − 2.5 K). In this talk, I will present our investigation on the superstructure deformation in the crystal lattice associated with the CDW order, utilizing Nuclear Magnetic Resonance (NMR) spectroscopy. Our observations shed light on the formation and configuration of CDW states and indicate a new avenue for further exploring the electronic structure evolution of various instabilities of kagome superconductors.