Abstract
Our recent year’s studies of the physical properties of the prototypal FeSe and molecule-intercalated (Li,Fe)OHFeSe superconductor systems are briefly reviewed here, with emphasis on the link between the superconducting and normal-state properties observed in the single crystals and films. These samples were successfully synthesized by our recently developed soft-chemical hydrothermal methods, which are also briefly described. Particularly in the Mn-doped high-Tc (Li,Fe)OHFeSe film, a strong enhancement of the superconducting critical current density was achieved, which is promising for practical application of the superconductivity.
Highlights
Iron-based superconductors [1] have received extensive attention because of their rich physics, including magnetic and nematic instabilities, electronic correlations, and quantum phenomena [2,3,4,5,6,7,8,9]
By developing hydrothermal ion-exchange [58,59,60] and iondeintercalation [61, 62] approaches, we have succeeded in synthesizing series of high-quality sizable single crystals of the intercalated (Li,Fe)OHFeSe and binary FeSe systems, respectively
We find that doping Mn into high-Tc (Li, Fe)OHFeSe films can raise the superconducting critical current density Jc by one order of magnitude to 0.32 MA/cm2 at a high field of 33 T [17]
Summary
Iron-based superconductors [1] have received extensive attention because of their rich physics, including magnetic and nematic instabilities, electronic correlations, and quantum phenomena [2,3,4,5,6,7,8,9]. By developing hydrothermal ion-exchange [58,59,60] and iondeintercalation [61, 62] approaches, we have succeeded in synthesizing series of high-quality sizable single crystals of the intercalated (Li,Fe)OHFeSe and binary FeSe systems, respectively.
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