Editing Superlattice (section)

== Discovery ==

Superlattices were discovered early in 1925 by Johansson and Linde<ref>{{cite journal|last1=Johansson|last2=Linde|title=The X-ray determination of the atomic arrangement in the mixed-crystal series gold-copper and palladium-copper|journal=Annalen der Physik|date=1925|volume=78|issue=21|page=439|doi=10.1002/andp.19253832104|bibcode=1925AnP...383..439J}}</ref> after the studies on [[gold]]–[[copper]] and [[palladium]]–copper systems through their special X-ray diffraction patterns. Further experimental observations and theoretical modifications on the field were done by Bradley and Jay,<ref>{{cite journal|last1=Bradley|last2=Jay|title=The formation of Superlattices in Alloys if Iron and Aluminium|journal=Proc. R. Soc. A|date=1932|volume=136|issue=829|pages=210–232|doi=10.1098/rspa.1932.0075|bibcode=1932RSPSA.136..210B|doi-access=free}}</ref> Gorsky,<ref>{{cite journal|last1=Gorsky|title=X-ray investigations of transformations in the CuAu alloy|journal=Z. Phys.|date=1928|volume=50|issue=1–2|pages=64–81|bibcode = 1928ZPhy...50...64G |doi = 10.1007/BF01328593 |s2cid=121876817}}</ref> Borelius,<ref>{{cite journal|last1=Borelius|title=The theory of transformations of metallic mixed phases|journal=Annalen der Physik|date=1934|volume=20|issue=1|page=57|doi=10.1002/andp.19344120105|bibcode=1934AnP...412...57B}}</ref> Dehlinger and Graf,<ref>{{cite journal|last1=Dehlinger|last2=Graf|title=Transformation of solid metal phases I. The tetragonal gold-copper alloy CuAu|journal=Z. Phys. Chem.|date=1934|volume=26|page=343| doi=10.1515/zpch-1934-2631 | s2cid=99550940 }}</ref> Bragg and Williams<ref>{{cite journal|last1=Bragg|first1=W.L.|last2=Williams|first2=E.J.|title=The effect of thermal agitation on atomic arrangement in alloys I|journal=Proc. R. Soc. A|date=1934|volume=145|issue=855|pages=699–730|doi=10.1098/rspa.1934.0132|bibcode=1934RSPSA.145..699B|doi-access=free}}</ref> and Bethe.<ref>{{cite journal|last1=Bethe|title=Statistical theory of superlattices|journal=Proc. R. Soc. A|date=1935|volume=150|issue=871|pages=552–575|doi=10.1098/rspa.1935.0122|bibcode=1935RSPSA.150..552B|doi-access=}}</ref> Theories were based on the transition of arrangement of atoms in crystal lattices from '''disordered''' state to an '''ordered''' state.