Local characterization of superconductivity in BaFe2(As1-xPx)2

Abstract

We use magnetic force microscopy (MFM) to characterize superconductivity across the superconducting dome in ${\mathrm{BaFe}}_2{\left(\mathrm{A}{\mathrm{s}}_{1-\mathrm{x}}{\mathrm{P}}_{\mathrm{x}}\right)}_2$, a pnictide with a peak in the penetration depth (${\lambda }_{ab}$) at optimal doping (${\mathrm{x}}_{\mathrm{opt}}$), as shown in sample-wide measurements. Our local measurements show a peak at ${\mathrm{x}}_{\mathrm{opt}}$ and a $T_C$ vs. ${\lambda }_{ab}^{-2}$ dependence similar on both sides of ${\mathrm{x}}_{\mathrm{opt}}$. Near the underdoped edge of the dome ${\lambda }_{ab}$ increases sharply suggesting that superconductivity competes with another phase. Indeed MFM vortex imaging shows correlated defects parallel to twin boundaries only in underdoped samples and not for $\mathrm{x}\ge {\mathrm{x}}_{\mathrm{opt}}$.

arXiv comment23 pages (11 main text, 12 support material)

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• Diamagnetic Vortex Barrier Stripes in Underdoped $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$
• 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
• Selective mass enhancement close to the quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Cluster structure of superconducting phase and the nature of peaks in the doping dependences of the London penetration depth in iron pnictides
• Inhomogeneous magnetic multiband superconductors
• Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point
• Josephsonic diagnostic of competing orders in quantum critical multiband superconductors
• Transport anomalies in multiband superconductors near quantum critical point
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• Quasiclassical theory of $C_4$-symmetric magnetic order in disordered multiband metals
• The mechanism of doping and the features of phase diagrams of HTSC cuprates and ferropnictides