Diamagnetic Vortex Barrier Stripes in Underdoped BaFe2(As1-xPx)2

TYPEStudent Seminar
Speaker:Alon Yagil
Affiliation:Physics Department Technion
Location:Lidow Nathan Rosen (300)
Abstract:We report magnetic force microscopy (MFM) measurements on underdoped BaFe2(As1−xPx)2 (x = 0.26) that show enhanced superconductivity along stripes parallel to twin boundaries. These stripes of enhanced diamagnetic response repel vortices when we cool in a finite magnetic field and act as barriers when we drag vortices with the magnetic MFM tip. The stripes disappear when we warm the sample towards the superconducting transition temperature. We show that stripes can move when we warm the sample and comment on the relationship between the stripes and similar stripes observed previously in Ba(Fe1−xCox)2As2.