290S/290K Quantum Materials Seminar: Chandra Varma (UCB); Wednesday, February 21 at 2:00 PM Pacific Time in 402 Physics South
Time/Venue: Wednesday, February 21 at 2:00 PM Pacific Time in 402 Physics South and via Zoom:
https://berkeley.zoom.us/j/99523499113pwd=REovb3pyam03WXQwbEhrU3dqNHZvdz09
Meeting ID: 995 2349 9113 Passcode: 600704
Host: Ehud Altman
Title: 6e and 4e flux quantization in a Kagome superconductor
Abstract: 6 elliptical Fermi-surface pockets are found below about 90 K in a
compound with the Kagome lattice structure. The phase fluctuations of the
usual 2e super-conducting state in this situation are similar to that of a that of
a frustrated xy model on a triangular lattice, and extend over a very large
fluctuation region. Metastable 6e and 4e states can be constructed in this
fluctuation regime with the usual xy fluctuations.
Experimental observation of very wide fluctuation regime in which
6e and 4e flux-quantization is observed through a Little-Parks type
experiments are discussed in relation to the theory.
See the Physics Department calendar for future seminars.