Hey all, I am a graduate student (in chemistry) working on oxide crystals. Our group has a SQUID magnetometer which we use for magnetic property measurements. The other day a fellow student and myself got into a discussion about LS coupling and crystal electric fields. I know that CEF will quench the LS coupling, making the magnetic properties a function of only the electron spin contribution. So, in the presence of weak CEF effects, LS coupling becomes more predominant and is seen when we investigate the magnetic moment. My question is, what (if any) other factors influence the strength of LS coupling in oxide crystals? I was taught that Russel Saunders coupling (J = L + S) was always present, and I thought that the CEF was the only factor that quenches the coupling, but my colleague asserts that there must be other factors (material specific) that quenches LS coupling. I am open to this idea, but I'd like to know what those factors are. Thanks in advance!