cse • paper_2 • solid_state_electronics
[UPSC CSE 2021] Band theory of solids (Q61, 20M)
A solid contains a dilute concentration of \mathrm{Nd}^{3+} ions, each of which possess three 4f electrons. Assuming that there are 10^{25}\ \mathrm{m}^{-3} of these ions, calculate the magnetic susceptibility of the sample at 1\,\mathrm{K}.
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