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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-5235
DTSTART:20200206T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T041031Z
LAST-MODIFIED:20200204T143139Z
LOCATION:5310 Chamberlin
SUMMARY:Studying superconductors using NV-centers in diamond optical m
 agnetometry\, R. G. Herb Condensed Matter Seminar\, Ruslan Prozorov\, 
 Iowa State/Ames Lab
DESCRIPTION:The variation of magnetic fields across the superconductin
 g samples is quite small in the fragile genuine Meissner state\, which
  is easily disturbed by Abrikosov vortex pining and field inhomogeneit
 ies due to  large demagnetization effects. We developed minimally inva
 sive optical magneto-sensing based on the  ensembles of NV centers in 
 diamond crystal to study Meissner state structure and to determine the
  lower critical field. I will show how different the structure of the 
 Meissner state is in different superconducting materials. I will also 
 discuss the application of the NV sensing to identify quantum phase tr
 ansition in charge-doped iron-based superconductors.
URL:https://www.physics.wisc.edu/events/?id=5235
END:VEVENT
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