Volume 57, Number 5, March 2002
|Page(s)||704 - 710|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Mesoscopic frustrated phase separation in electronic systems
INFM - Dipartimento
di Fisica, Università di Roma “La Sapienza”
Piazzale A. Moro 2, I-00185 Roma, Italy
2 Consejo Nacional de Investigaciones Científicas y Tecnicas Centro Atómico Bariloche and Instituto Balseiro 8400 S. C. de Bariloche, Argentina
Accepted: 4 December 2001
We analyze phase separation (PS) among two electronic phases, frustrated by the long-range Coulomb interaction. We define a dimensionless parameter λ which characterizes the degree of frustration. Frustrated PS appears abruptly as a function of the global electronic density and exhibits strong nonlinearities as compared with ordinary PS. Inhomogeneities of one phase, hosted by the other phase, result on a scale of the order of or smaller than the electric-field screening length. In general above a critical λ the system remains in a single phase except close to a critical electronic density where PS among neutral phases is accompanied by a lattice instability.
PACS: 64.75.+g – Solubility, segregation, and mixing; phase separation / 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.10.Ca – Electron gas, Fermi gas
© EDP Sciences, 2002
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