Spectroscopic Evidence of Competing Diagonal Spin Interactions and Spin Disproportionation in the Bilayer Nickelate La${}_3$Ni${}_2$O${}_7$

Dong-Hyeon Gim, Dirk Wulferding, Hengyuan Zhang +2

A comprehensive spectroscopic map of the electronic, magnetic, and lattice excitations is presented for the bilayer nickelate La${}_3$Ni${}_2$O${}_7$ using Raman scattering at ambient pr…