Figure 1.17
Representation of the magnetic susceptibility (χ) tensor in the presence of an external magnetic field, B0. χ̃xx, χ̃yy and χ̃zz are the components of the χ tensor in its principal axis frame, i.e., in the frame of reference where the χ matrix is diagonal. For an arbitrary orientation of the crystal in the B0 field, the magnetic susceptibility is given by the length of the vector χkk.72
