Unconventional superconductivity and Charge Order in Kagome Lattices Revealed by Muon Spin Rotation

Date

Nov 15, 2024

Time

11:00 AM - 12:00 PM

Speaker

Dr. Zurab Guguchia

Affiliation

Paul Scherrer Institute, Villigen, Schweiz

Language

en

Main Topic

Materialien

Host

Rita Taubert

Description

Kagome lattices stand at the forefront of research due to their fascinating interplay of topology, correlations, and magnetism [1-3]. In my talk, I aim to shed light on the latest experimental developments concerning superconductivity and the magnetic aspects of charge order in various kagome-lattice systems, studied from the perspective of local magnetic probe. This involves the use of muon-spin rotation (µSR) as a function of depth from the sample surface and under extreme conditions like hydrostatic pressure, uniaxial strain, ultra-low temperatures, and high magnetic fields. µSR is complemented by magnetoresistance and X-ray diffraction techniques. Key systems under discussion will include: (1) The AV3Sb5 (A = K, Rb, Cs) compound series with V kagome lattice, notable for displaying a range of symmetry-breaking electronic orders [4], such as charge order and superconductivity. Here, we have identified a depthtunable time-reversal symmetry-breaking state associated with charge order [5-8]. Additionally, we have found a chain of evidence for unconventional superconductivity [6,7,9]. (2) The bilayer kagome material ScV6Sn6, where hidden magnetism within the charge-ordered state was observed [10]. (3) The LaRu3Si2 system with Ru kagome layers, in which we identified two distinct types of charge order (bond order), with one manifesting above room temperature [11,12]. This finding marks the first instance of observing a charge-ordered state at or above room temperature in a correlated kagome lattice.

Links

• Seminars at the IFW

Last modified: Nov 15, 2024, 7:38:26 AM