Atomic diamagnetism within a dense plasma.
In this paper we have studied the influence of plasma electron polarization around a charged atomic impurity on the diamagnetic response behavior of the impurity ion, when subject to large-scale magnetic fields within high-density plasmas. As a typical example, we consider the two-electron ion C4+ (Z=6) in its ground state 1s(2):(1)S. Calculation performed within the Hartree-Fock approximation under the framework of the ion sphere model for the plasma-embedded impurity ion suggests that, in a high-density regime, the diamagnetic shift of the ground state is a bivariate function of the magnetic field and the plasma electron density. Also, it is shown that the magnitude of the diamagnetic susceptibility of the impurity ion increases with increasing plasma electron density, implying that the ion becomes more diamagnetic as a direct consequence of the increased orbital radii of its bound charges under enhanced density-induced screening.
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Condensed Matter Physics Group, Saha Institute of Nuclear Physics, Sector-1, Block-AF, Bidhannagar, Calcutta 700 064, India. debasis@cmp.saha.ernet.in