january, 2020
22jan3:00 pm4:00 pmKoen BastiaansLeiden University, Netherlands3:00 pm - 4:00 pm Saturn Seminar Room
Event Details
Koen Bastiaans Academic Affiliation: Leiden University, Netherlands Research Area: Develop and use novel techniques for STM to investigate quantum matter. Talk date: January 22, 2020 A strongly inhomogeneous superfluid in an iron-based
Event Details
Koen Bastiaans
Academic Affiliation: Leiden University, Netherlands
Research Area: Develop and use novel techniques for STM to investigate quantum matter.
Talk date: January 22, 2020
A strongly inhomogeneous superfluid in an iron-based superconductor
Although the possibility of spatial variations in the superfluid of unconventional, strongly correlated superconductors has been suggested, it is not known whether such inhomogeneities – if they exist – are driven by disorder, strong scattering, or other factors. In this talk I will show how we use Josephson scanning tunneling microscopy to reveal a strongly inhomogeneous superfluid in the iron-based superconductor FeTe0.55Se0.45. By simultaneously acquiring the topographic and electronic properties, we find that this inhomogeneity in the superfluid is not caused by structural disorder or strong inter-pocket scattering, and does not correlate with variations in the energy of the Cooper pair-breaking gap. Instead, we see a clear spatial correlation between superfluid density and the quasiparticle strength, defined as the height of the coherence peak, on a local scale. [1]
References:
[1] D. Cho*, K.M. Bastiaans* et al. Nature 571, 541 (2019)
Time
(Wednesday) 3:00 pm - 4:00 pm