We investigated current induced depairing in the topological insulator-chalcogenide interface superconductor. The measured depairing current density provides information on the magnetic penetration depth and superfluid density, which in turn shed light on the nature of the normal state that underlies the interfacial superconductivity.
DOI:https://doi.org/10.1103/PhysRevB.92.094502
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(a) Resistive transitions for sample A in zero magnetic field at transport current values of (left to right): 38.6, 32.4, 22.1, 15.4, 11.5, 6.34, 2.57, 0.0534 mA. The lowest current (red crosses) is continuous dc; the remaining currents are pulsed. (b) Two-thirds power of the applied current vs the temperature where the curves in upper panel are intersected by the horizontal dashed lines defining the following normalized-resistance criteria: , 0.64, 0.75, 0.83, and 0.91 (where is the normal-state resistance). (c) The applied currents are plotted linearly against the same temperatures as in the middle panel. Straight lines are guides to the eye.
Reuse & Permissions(a) Two-thirds power of the applied current vs the temperature for sample B for the following normalized-resistance criteria: , 0.62, 0.69, 0.81, and 0.92 (where is the normal-state resistance). (b) The same applied-current data plotted linearly against the same temperatures as in panel (a). Straight lines are guides to the eye.
Reuse & Permissions(a) Resistance vs current curves for sample A at various fixed temperatures. The plateaus, where the current ( A) has completely destroyed the superconductivity, represent the normal resistances for each . (b) The resistive current , defined at 90% of for each , vs temperature for sample A. The linear fit to the higher temperature data produces an intercept of A. The horizontal dashed line shows that the function tends to saturate to a value of A at low temperature. (c) Similar data for sample B, with A. Here the linear fit extrapolates to an intercept of A.
Reuse & Permissions(a) Resistivity of pure FeTe deposited on ZnSe/GaAs without any top layer. (b) Intrinsic normal-state resistivity of the interface for samples A (red triangles) and B (black circles).
Reuse & Permissions
