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Appendix AChronological Survey of SelectedPublications
Until today most Fe-based superconducting thin films were grown by pulsed laserdeposition (∼60% of publications), followed by molecular beam epitaxy (∼23%).Other methods, RF-sputter deposition, electrodeposition and chemical vapor deposi-tionmethods, for example, were onlymarginally exploited. This can be seen from thenumber of publications devoted to thin film growth of iron pnictides and iron chalco-genides that appeared since 2008. The dominant appearance of both methods can beexplained by two facts: (i)Most thin film research groups, that entered the field of Fe-based superconductors, have used pulsed laser deposition and achieved reasonableresults. (ii) Molecular beam epitaxy, was mainly used in the growth of monolayerFeSe films, which produced a lot of research output. Despite some drawbacks whenit comes to the incorporation of volatile elements at high temperatures, bothmethods,pulsed laser deposition as well as molecular beam epitaxy, have demonstrated a greatpotential in the growth of the new Fe-based superconductors.
TableA.1 provides a chronological list of the first thin film publication of eachcompound and also the arXiv-source, if available.
382 Appendix A: Chronological Survey of Selected Publications
Table A.1 First publications of different Fe-based superconducting thin films in chronologicalorder according to the journal publication. Methods: ED = electrodeposition, MBE = molecularbeam epitaxy,MOCVD=metal-organic chemical vapor deposition, PLD= pulsed laser deposition.The onset critical temperatures do not necessarily correspond to the optimized valuesDate Compound Method Tc,on (K) Comment arXiv: Refs.
aFirst publication after 2008 with an investigation of superconductivity
Appendix BSpace Groups and Brillouin Zones
The most important structure-types for Fe-based superconductors are the ThCr2Si2-type which is described by a Bravais lattice type t I and space group I4/mmm(No. 139) [28] and the anti-PbO-type, Cu2Sb, ZrCuSiAs, which all are describedby a Bravais lattice type t P and space group P4/nmm (No. 129) [29]. All latticesbelong to the tetragonal crystal family (a = b �= c; α = β = γ = 90◦). The spacegroup tables can be found in Sect. 2.2 of the International Tables for CrystallographyA. For the coordinates of the Wyckoff positions of space group P4/nmm given inSect. 1.2 the origin at 4̄m2 at 4̄/nm2/g, at−1/4, 1/4, 0 from centre (2/m) was chosen[29]. For the centrosymmetric space group I4/mmm the center of symmetry is theorigin.
An exact description of the Brillouin zones (BZs) can be found in Sect. 1.5 byMois I. Aroyo and Hans Wondratschek: International Tables for Crystallography B(2010) [30]. FigureB.1a, b shows exemplarily the BZs of a primitive and a bodycentred tetragonal lattice with points and lines of symmetry. In Fig.B.1c, d explainsthe correlation between the unfolded (1-Fe uc) and the folded BZ (2-Fe uc) of theFe-based superconductors in the (kx , ky)-plane.
Fig.B.1 Brillouin zones (BZs) of (a) a primitive tetragonal lattice and (b) a body centered tetragonallattice with c/a > 1 (arithmetic crystal class 4/mmmI). Points and lines of symmetry are indicated.The irreducible wedge of the BZ is colored. Tetragonal BZ in the (kx , ky)-plane for (c) the 1-Fe unitcell (‘unfolded BZ’) and (d) the 2-Fe unit cell (‘folded BZ’) of Fe-based superconductors with twohole and two electron bands at the Fermi level. Folding lines and folding directions are indicated
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386 Appendix B: Space Groups and Brillouin Zones
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