Improvement of superconducting properties of FeSe0.5Te0.5 single crystals by Mn substitution

Abstract

We report on structural, susceptibility, conductivity, and heat-capacity studies of FeSe0.5Te0.5 single crystals with 2% substitution of Mn for Fe. Mn-doped samples show a higher onset temperature, a narrower width of the superconducting transition, and a higher magnitude of the jump in the specific heat at Tc in compared to undoped samples. From the resistivity data in magnetic fields parallel to the c axis we derived an upper critical field Hc2 of ~580 kOe for doped samples compared to 490 kOe for pure samples. Using a single-band BCS model we can describe the electronic specific heat in the superconducting state with a gap Delta(T=0) = 31 K for the Mn doped sample in comparison to 26 K for pure FeSe0.5Te0.5.

arXiv comment14 pages, 6 figures, 2 tables, 38 references

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• Doping Mn into (Li1-xFex)OHFe1-ySe superconducting crystals via ion-exchange and ion-release/introduction syntheses
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• Enhancement of the superconducting transition temperature in Mn-doped CaKFe4As4 processed by the high gas-pressure and high-temperature synthesis method