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We investigated the superconducting properties of Fe_(1+y)Te_(0:6)Se_(0:4) single-crystalline microbridges with a width of 4 m and thicknesses ranging from 20.8 to 136.2 nm. The temperature-dependent in-plane resistance of the bridges exhibited a type of metalinsulator transition in the normal state. The critical current density(J_c) of the microbridge with a thickness of 136.2 nm was82.3 kA/cm~2 at 3K and reached 105 kA/cm~2 after extrapolation to T = 0 K. The current versus voltage characteristics of the microbridges showed a Josephson-like behavior with an obvious hysteresis. These results demonstrate the potential application of ultra-thin Fe-based microbridges in superconducting electronic devices such as bolometric detectors.
We investigated the superconducting properties of Fe_ (1 + y) Te_ (0: 6) Se_ (0: 4) single-crystalline microbridges with a width of 4 m and thicknesses ranging from 20.8 to 136.2 nm. resistance of the bridges exhibited a type of metalinsulator transition in the normal state. The critical current density (J_c) of the microbridge with a thickness of 136.2 nm was82.3 kA / cm ~ 2 at 3K and reached 105 kA / cm ~ 2 after Extrapolation to T = 0 K. The current versus voltage characteristics of the microbridges showed a Josephson-like behavior with an obvious hysteresis. These results demonstrate the potential application of ultra-thin Fe-based microbridges in superconducting electronic devices such as bolometric detectors.