Exotic phase transition and superconductivity in layered titanium-oxypnictides implied by a computational phonon analysis

Kousuke Nakano, Kenta Hongo, Ryo Maezono

We applied $ab$ $initio$ phonon analysis to layered titanium-oxypnictides, Na${}_2$Ti${}_{2}P{n}_2$O ($Pn$ = As, Sb), and found a clear contrast between the cases with lighter/heavier pnic…