Fill in the missing steps from (4.9.30) to (4.9.31). First, write a Sommerfeld expansion to second order
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Fill in the missing steps from (4.9.30) to (4.9.31). First, write a Sommerfeld expansion to second order in T for the total electron number N. The lowest-order terms of both U and N can then be expanded as
Using the constraint that N is constant for all temperatures, you can obtain a relation for μ in terms of T and substitute this into the equation for U, and then take its derivative, keeping terms to lowest order in T.
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