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Herzfeld instability versus Mott transition in metal-ammonia solutions | | Gennady N. Chuev
; Pascal Quemerais
; | | Date: |
17 Jan 2007 | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | | Abstract: | Although most metal-insulator transitions in doped insulators are generally viewed as Mott transitions, some systems seem to deviate from this scenario. Alkali metal-ammonia solutions are a brilliant example of that. They reveal a phase separation in the range of metal concentrations where a metal-insulator transition occurs. Using a mean spherical approximation for quantum polarizable fluids, we argue that the origin of the metal-insulator transition in such a system is likely similar to that proposed by Herzfeld a long time ago, namely, due to fluctuations of solvated electrons. We also show how the phase separation may appear: the Herzfeld instability of the insulator occurs at a concentration for which the metallic phase is also unstable. As a consequence, the Mott transition cannot occur at low temperatures. The proposed scenario may provide a new insight into the metal-insulator transition in condensed-matter physics. | | Source: | arXiv, cond-mat/0701402 | | Services: | Forum | Review | PDF | Favorites | |
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