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- W2139803039 abstract "Abstract A general exact result is derived for the coefficient Bx(n; T) which determines the first gradient correction to the leading exchange contribution to the free energy at finite temperature of a weakly inhomogeneous extended many fermion system having arbitrary two-body interactions. Explicit analytical results are given in the case of bare Coulomb interactions, and the case of statically screened Coulomb interactions is studied numerically. It is shown that nonanalytical structure leads to different limiting values of Bx(n; T) when the inverse screening length and the temperature are both small. Some implications for physical many-electron systems are discussed, including the reasons for discrepancies between the first principles and semiempirical gradient coefficients for atomic exchange energies." @default.
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- W2139803039 date "1993-10-01" @default.
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- W2139803039 title "Nonlocal gradient corrections to the exchange free energy of an inhomogeneous many-fermion system at finite temperature" @default.
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- W2139803039 doi "https://doi.org/10.1016/0038-1098(93)90774-h" @default.
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