Two-dimensional-like superconducting properties and weak antilocalization transport in FeSe0.4Te0.6 single crystals: Topology-driven magnetotransport
Chin-Wei Lin, I Nan Chen, Zhujialei Lei, Li Min Wang
DOI 10.1103/PhysRevB.108.214509 · Physical Review B
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Abstract
Investigations of the superconducting properties of FeSe0.4Te0.6 single crystals have demonstrated that these iron-based superconductors hold the potential to host Dirac-cone-type surface states and two-dimensional (2D) topological superconducting states. Experimental observations detected Berezinsky-Kosterlitz-Thouless transition and transport vortex dynamics, suggesting a dominant role of topological surface states in magnetotransport at low temperatures. In the normal state, FeSe0.4Te0.6 demonstrated a weak antilocalization transport feature due to the topological nature at temperatures T <16.5 K and negative magnetoresistance characteristic due to the suppression of spin-disorder scattering induced by the Kondo effect as the temperature reached 40 K. Additionally, the annealing process of FeSe0.4Te0.6 single crystals caused a shift from the initial three-dimensional transport pattern to one that more closely resembles a 2D transport system. These findings support the notion that FeSe0.4Te0.6 holds promise as a platform for investigating topological superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe0.4Te0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.03 | Pressure not reported | onset |
| FeSe0.4Te0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.1 | Pressure not reported | onset |
| FeSe0.4Te0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.28 | Pressure not reported | midpoint |
| FeSe0.4Te0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.28 | Pressure not reported | midpoint |
| FeSe0.5Te0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe0.45Te0.55 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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