BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260815T180427Z
LAST-MODIFIED:20190912T172401Z
DTSTART:20190913T160000Z
DTEND:20190913T170000Z
UID:event2184@bu.edu
URL:http://physics.bu.edu/internal/events/show/2184
SUMMARY:Debye mechanism of giant microwave absorption in superconductors
DESCRIPTION:Featuring Boris Spivak\, University of Washington\nHosted by: C
	hristopher Laumann\n\nPart of the Biophysics/Condensed Matter Seminar Serie
	s.\n\nI will discuss a mechanism of microwave absorption in conventional an
	d unconventional  superconductors which is similar to the Debye absorption 
	mechanism in molecular gases. The contribution of this mechanism to AC cond
	uctivity is proportional to the inelastic quasiparticle relaxation time rat
	her than the elastic one and therefore it can be much larger than the conve
	ntional one. The Debye contribution to the linear conductivity arises only 
	in the presence of a DC supercurrent in the system and its magnitude depend
	s strongly on the orientation of the microwave field relative to the superc
	urrent. The Debye contribution to the non-linear conductivity exists even i
	n the absence of the supercurrent. It provides an anomalously low non-linea
	r threshold. Microwave absorption measurements may provide direct informati
	on about the inelastic relaxation times in superconductors.\n\nI will also 
	discuss a closely related problem of resistance of superconductor-normal me
	tal-superconductor junctions.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR