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Synthesis, characterization and transport properties of superconducting FeSe0.36S0.64 single crystal
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O511+.3

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    Abstract:

    FeSe has a unique ground state in which superconductivity coexists with a nematic order without long-range magnetic ordering, providing a significant opportunity to investigate the correlation between the nematic phase and the unconventional superconductivity in iron-based superconductors (IBSs). Previous studies have shown that the nematic phase was gradually suppressed by isovalent S substitution in FeSe1-xSx, meanwhile, the superconducting gap structure abruptly changed once the nematic phase vanished at the quantum critical point x ~ 0.17, indicating that the nematic phase plays a key role on the pairing mechanism. Unfortunately, the crystals with S doping level x > 0.21 have not yet synthesized via the conventional crystal growth method until now, which limited the research on the high doping levels.This work have successfully prepared FeSe0.36S0.64 crystals with superconducting transition temperature Tc ~ 5 K using hydrothermal method for the first time. In order to get more insight into the normal state properties, the article presented the magnetoresistance and Hall effect measurements by six-probe method. It is found that the Kohler"s rule is strongly violated, and the negative Hall coefficient shows strong but nonmonotonic T-dependence below about 120 K, which may be intimately related with the multiband electronic structure in this system. The hydrothermal method is of great significance for the crystals grown of FeSe1-xSx with different S doping level and the investigation of the unconventional superconductivity in 11-type IBSs.

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[qinlingyao. Synthesis, characterization and transport properties of superconducting FeSe0.36S0.64 single crystal[J]. Rare Metal Materials and Engineering,2021,50(2):654~657.]
DOI:10.12442/j. issn.1002-185X.20200153

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History
  • Received:March 08,2020
  • Revised:April 07,2020
  • Adopted:April 17,2020
  • Online: March 09,2021
  • Published: