Phase transition in a simple plasma model

Details Phase transition in a simple plasma model Phase transition in a simple plasma model

2009-01-22

arxiv.org/abs/0901.3535v1

High Temperature, v. 23, N 6, pp. 807-814 (1985)

Physics

Plasma Physics

8 pages, 8 figures

Scientific paper

A phase transition of gas-liquid type with an upper critical point is examined which arises in a model of charges of one sign on compensating background (OCP). The phase transition parameters are dependent on the detailed assumptions about the compressibility of the background, but the occurrence of this transition is independent on the background equation of state. In the electron-gas model ('jellium'), this transition appears to rule out Wigner crystallization. A variational principle in statistical mechanics is used to derive so-called Double-OCP model for a superposition of two one-component plasma models for charges of opposite sign. The free energy of this model sets an upper bound to that of a real plasma. Situations are discussed where this transition should manifest itself in anomalies in the approximate description of a non-ideal plasma.

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