Diamagnetic Vortex Barrier Stripes in Underdoped $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$

Abstract

We report magnetic force microscopy (MFM) measurements on underdoped $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$ ($x=0.26$) 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 $Ba(F{e}_{1-x}C{o}_x{)}_{2}A{s}_2$.

16 pages (including appendices), 10 figures. The updated version has a new figure (Fig. 7), improved figures and text that has been edited for clarity

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Cited by in corpus (7)

• Nematicity in the superconducting mixed state of strain detwinned underdoped $\text{Ba}({\text{Fe}}_{1-x}{\text{Co}}_x{)}_2{\text{As}}_2$
• Dependence of the absolute value of the penetration depth in $(\mathbf{B}{\mathbf{a}}_{1-\mathbf{x}}{\mathbf{K}}_{\mathbf{x}})\mathbf{F}{\mathbf{e}}_2\mathbf{A}{\mathbf{s}}_2$ on doping
• Large-scale modulation in the superconducting properties of thin films due to domains in the $SrTi{O}_3$ substrate
• Non-Gaussian tail in the force distribution: A hallmark of correlated disorder in the host media of elastic objects
• Delocalization of vortex magnetic field near a planar defect
• Transport evidence for twin-boundary pinning of superconducting vortices in FeSe
• A Ginzburg-Landau approach to the vortex-domain wall interaction in superconductors with nematic order