High-Temperature Superconductivity and Lattice Relaxation in Lithium-Deposited FeSe on SrTiO₃

Observation of topological transition in high- Tc superconducting monolayer FeTe1−xSex films on Peng1, Li2, Wu3 et al. 2019Phys. Rev. B471300View full textAdd to dashboardCite

“…The topological transition can be tuned by Te doping. Moreover, the position of topological bands can be tuned by abundant methods, including post anneal treatment [19], alkali metal doping [40,41], changing various substrates [42][43][44] and electric field regulation [45][46][47]. To directly observe the topological edge states by ARPES, we suggest that FeTe1-xSex monolayers should be grown on STO substrates with densely parallel edges, which can be obtained by chamfering STO at specific angle.…”

Strain tuning of nematicity and superconductivity in single crystals of FeSe

“…Figure 3 shows the phase diagrams for bulk FeSe under strain and thin films of FeSe epitaxially strained by different substrates. For thin films, the strain is mainly induced by the mismatch in the lattice parameters between the film and the substrate [37,50]. Interestingly, the compressive uniaxial strain enhances superconductivity but it seems to suppress the nematic phase for both bulk and epitaxial films, suggesting that the two phases are competing with each other, similar to what is found under small applied hydrostatic and chemical pressure [16,19,51] However, these opposite trends of the superconductivity versus nematicity under strain are in contrast to the effect of growth conditions and disorder [33].…”

Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

“…Doping level can be tuned and phase diagrams of T C are obtained. [8,[15][16][17][18] Comparing these phase diagrams, two important pieces of information can be drawn. First, there exists a superconductor-insulator transition in a higher doping regime.…”