Slides

Consequences from a strong crystal field
If crystal field has low symmetry, the degeneracy is lifted and the time
average yields zero orbital moment:
L z
= 0
The ground state is characterized by an s-character and (2S+1)-
degeneracy.
= S and L
The saturation magnetization is then:
J
Magnetization measurements yield directly S, the maximum S value in the
d-shell is S=5/2 with m = 5µ B (i.e. Cr + (3d 5 4s 0 ) and Mn 2+ (3d 5 4s 0 )).
= 0
N N
M
S
= gSµ
BS
= µ
B
2S
V V
H. Zabel 3. Lecture: Local Moments
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