Dielectric signatures of lattice instabilities at 32K and 245K in $L{a}_{2-y}S{r}_{y}M{O}_{4+x}$ (M=Cu,Ni) Cuprates and Nickelates

P. V. Parimi, N. Hakim, F. C. Chou +2

New dielectric transitions are observed at common temperatures 32K and 245K, in isostructural $L{a}_{2}Cu{O}_{4+x}$ and $L{a}_{5/3}S{r}_{1/3}Ni{O}_4,$ that are signatures of local lattice…