The biaxial-strained Sr 4 Al 2 O 7 film has a tetragonal structural symmetry, enabling coherent growth of high-quality ABO 3 /SAO T epitaxial heterostructures, which suppresses the crack formation ...

A simulation study now shows that the nucleation of water into atomic stackings of cubic and hexagonal ices occurs through a metastable precursor phase with tetragonal symmetry, and that this ...