Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Q15: Vortices and Magnetic Field Effects in Superconductors
3:00 PM–5:36 PM,
Wednesday, March 6, 2024
Room: M100F
Sponsoring
Unit:
DCMP
Chair: Avadh Saxena, Los Alamos National Laboratory
Abstract: Q15.00012 : Visualizing Dynamics of Vortex Clusters in Multiband Superconductor CaSb2*
5:12 PM–5:24 PM
Presenter:
Yusuke Iguchi
(Stanford University)
Authors:
Yusuke Iguchi
(Stanford University)
Nabhanila Nandi
(Stanford University)
Mohamed Oudah
(University of British Columbia)
Joern Bannies
(University of British Columbia)
Meigan C Aronson
(University of British Columbia)
Douglas A Bonn
(University of British Columbia)
Kathryn A Moler
(Stanford University)
Using a scanning superconducting quantum interference device (SQUID) susceptometer, we observed vortex clusters in bulk single crystals of CaSb2, studied the dynamics of both isolated vortices and vortex clusters, and imaged the diamagnetic response. The diamagnetic response was relatively homogeneous, supporting the hypothesis that the vortex clusters arise from vortex-vortex interactions and not from inhomogeneity. The temperature dependence of the fitted superfluid density fits well with a weak-coupling s-wave model. In this presentation, we delve into the finer details of the observed vortex and vortex cluster dynamics, comparing the observations to simulations that include various models of vortex-vortex interactions.
*This work was primarily supported by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE- AC02-76SF00515.
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