We report the success in introducing Mn into（Li1-xFex）OHFe1-y Se superconducting crystals by applying two different hydrothermal routes, ion exchange（1-step） and ion release/introduction（2-step）. The micro-regio...We report the success in introducing Mn into（Li1-xFex）OHFe1-y Se superconducting crystals by applying two different hydrothermal routes, ion exchange（1-step） and ion release/introduction（2-step）. The micro-region x-ray diffraction and energy dispersive x-ray spectroscopy analyses indicate that Mn has been doped into the lattice, and its content in the 1-step fabricated sample is higher than that in the 2-step one. Magnetic susceptibility and electric transport properties reveal that Mn doping influences little on the superconducting transition, regardless of 1-step or 2-step routes. By contrast, the characteristic temperature T^＊, at which the negative Hall coefficient reaches its minimum, is significantly reduced by Mn doping.This implies that the hole carriers contribution is obviously modified, and hence the hole band might have no direct relationship with the superconductivity in（Li1-xFex）OHFe1-y Se superconductors. Our present hydrothermal methods of ion exchange and ion release/introduction provide an efficient way for elements substitution/doping into（Li1-xFex）OHFe1-y Se superconductors, which will promote the in-depth investigations on the role of multiple electron and hole bands and their interplay with the high-temperature superconductivity in the FeSe-based superconductors.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11574370 and 61501220)Frontier Program of the Chinese Academy of Sciences(Grant Nos.QYZDY-SSW-SLH001 and QYZDY-SSW-SLH008)+1 种基金the National Basic Research Program of China(Grant Nos.2013CB921700 and2016YFA0300301)"Strategic Priority Research Program(B)"of the Chinese Academy of Sciences(Grant No.XDB07020100)
文摘We report the success in introducing Mn into（Li1-xFex）OHFe1-y Se superconducting crystals by applying two different hydrothermal routes, ion exchange（1-step） and ion release/introduction（2-step）. The micro-region x-ray diffraction and energy dispersive x-ray spectroscopy analyses indicate that Mn has been doped into the lattice, and its content in the 1-step fabricated sample is higher than that in the 2-step one. Magnetic susceptibility and electric transport properties reveal that Mn doping influences little on the superconducting transition, regardless of 1-step or 2-step routes. By contrast, the characteristic temperature T^＊, at which the negative Hall coefficient reaches its minimum, is significantly reduced by Mn doping.This implies that the hole carriers contribution is obviously modified, and hence the hole band might have no direct relationship with the superconductivity in（Li1-xFex）OHFe1-y Se superconductors. Our present hydrothermal methods of ion exchange and ion release/introduction provide an efficient way for elements substitution/doping into（Li1-xFex）OHFe1-y Se superconductors, which will promote the in-depth investigations on the role of multiple electron and hole bands and their interplay with the high-temperature superconductivity in the FeSe-based superconductors.
