Physics Help Forum Susceptibility of a simple metal (Problem 31.6 in Ashcroft's

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 May 14th 2017, 07:49 AM #1 Junior Member     Join Date: Aug 2009 Posts: 4 Susceptibility of a simple metal (Problem 31.6 in Ashcroft's 1. The problem statement, all variables and given/known data The susceptibility of a simple metal has a contribution ##\chi_{c.c}## from the conduction electrons and a contribution ##\chi_{ion}## from the diamagnetic response of the closed-shell core electrons. Taking the conduction electron susceptibility to be given by the free electron values of the Pauli paramagnetic and Landau diamagnetic susceptibilities, show that: $$\frac{\chi_{ion}}{\chi_{c.c}} = -\frac{1}{3} \frac{Z_c}{Z_v}\langle (k_F r)^2 \rangle$$ where ##Z_v## is the valence, ##Z_c## is the number of core electrons, and #### is the mean square ionic radius defined in (31.26). 2. Relevant equations $$(31.26) = \frac{1}{Z_i} \sum <0|r_i^2 |0>$$ $$\chi^{molar} = -Z_i (e^2/(\hbar c))^2 \frac{N_A a_0^3}{6}\langle (r/a_0)^2 \rangle$$ $$\chi_{pauli} = \bigg(\frac{\alpha}{2\pi}\bigg)^2 (a_0k_F)$$ $$\chi_{Landau} = -1/3 \chi_{Pauli}$$ 3. The attempt at a solution I thought that ##\chi_{molar}=\chi_{ion}## and that ##\chi_{c.c} = \chi_{Landau}+\chi_{Pauli} = 2/3 \chi_{Pauli}##. But when I divide between the two susceptibilities I don't get the right factors, has someone already done this exercise from Ashcroft and Mermin? I tried searching google for a solution but to a veil.

 Tags 316, ashcroft, metal, problem, simple, susceptibility

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