Achieving the depairing limit along $c$ axis in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals

Abstract

We report the achieving of depairing current limit along $c$-axis in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals. A series of crystals with $T_{\mathrm{c}}$ ranging from 8.6 K to 13.7 K (different amount of excess Fe, $y$) were fabricated into $c$-axis bridges with a square-micrometer cross-section. The critical current density, $J_{\mathrm{c}}$, was directly estimated from the transport current-voltage measurements. The transport $J_{\mathrm{c}}$ reaches a very large value, which is about one order of magnitude larger than the depinning $J_{\mathrm{c}}$, but comparable to the calculated depairing $J_{\mathrm{c}}$ $\sim$ 2 $\times$ 10${}^6$ A/cm${}^2$ at 0 K, based on the Ginzburg-Landau (GL) theory. The temperature dependence of the depairing $J_{\mathrm{c}}$ follows the GL-theory ($\propto$ (1-$T/T_{\mathrm{c}}$)${}^{3/2}$) down to $\sim$ 0.83 $T_{\mathrm{c}}$, then increases with a reduced slope at low temperatures, which can be qualitatively described by the Kupriyanov-Lukichev theory. Our study provides a new route to understand the behavior of depairing $J_{\mathrm{c}}$ in iron-based superconductors in a wide temperature range.

8 pages, 6 figures

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• Enhancement of $J$${}_c$ by Proton Irradiation in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_8$${}_{+}$${}_{\delta }$ Single Crystals
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