Influences of fluorine doping on the superconducting properties of β-FeSe

Oyster Pearl-Shaped Ternary Iron Chalcogenide, FeSe0.5Te0.5, Films on FTO through Electrochemical Growth from the Exchange of Chalcogens Boosted the Enzyme-Free Urea-Sensing Ability toward Real Analytes

“…The purity of various phases and crystal structures of the deposited films were examined by XRD analysis, and the emitted spectra are displayed in Figure 2a−c. Figure 2a shows diffractions from planes (101), (002), (110), (111), (102), (201), (103), (113), (212), and (301), which indicate pure tetragonal FeSe (JCPDS ID: 85−0735), 24 and only 112 of the ferroselite phase FeSe 2 have JCPDS ID 74− 0247. 25 The pattern in Figure 2b shows characteristic diffractions from (004), (003), (110), ( 113), (002), (113), and (112) planes of the frohbergite phase, which can be successfully indexed into a tetragonal structure, confirming iron telluride FeTe (JCPDS ID: 65−2808).…”

Synthesis and Characterization of Molybdenum- and Sulfur-Doped FeSe

“…FeSe has a structural transition at T s ∼87 K from the tetragonal-to-orthorhombic phase like other iron-based families by decreasing temperature, but unlike the other iron-based systems, this structure transition is not followed by magnetic order. − Overall, the nature and the electronic ordering boundary and superconductivity in most of the quasi-two-dimensional materials are still attractive problems. Particularly, in FeSe, the relation between superconductivity and nematicity is an unsolved question compared to the IBSCs-122-family. − One way to study the physical properties in quasi-two-dimensional materials is to investigate the effect of chemical doping. Therefore, many researchers try to use different elements of doping to replace Fe or Se sites .…”

“…Particularly, in FeSe, the relation between superconductivity and nematicity is an unsolved question compared to the IBSCs-122-family. − One way to study the physical properties in quasi-two-dimensional materials is to investigate the effect of chemical doping. Therefore, many researchers try to use different elements of doping to replace Fe or Se sites . Among the variety of possible substitutions, transition-metal (TM) ion substitution at the Fe site is the most informative with regard to questions such as the pairing symmetry and the nature of the low-energy excitation TM doped FeSe like Al, Ni, Co, Te, Ga, Cr, In, Ba, and Sm .…”

“…Therefore, many researchers try to use different elements of doping to replace Fe or Se sites. 11 Among the variety of possible substitutions, transition-metal (TM) ion substitution at the Fe site is the most informative with regard to questions such as the pairing symmetry and the nature of the low-energy excitation TM doped FeSe like Al, Ni, Co, Te, Ga, Cr, In, Ba, and Sm. 12 Some of the transition metals are doped into the β-FeSe structure, generally below 12 at.…”