General Rule and Materials Design of Negative Effective U System for High-T_c Superconductivity

Details General Rule and Materials Design of Negative Effective U System for High-T_c Superconductivity General Rule and Materials Design of Negative Effective U System for High-T_c Superconductivity

2008-07-24

arxiv.org/abs/0807.3770v1

Physics

Condensed Matter

Superconductivity

11 pages, 1 figures, 2 tables, APEX in printing

Scientific paper

Based on the microscopic mechanisms of (1) charge-excitation-induced negative effective U in s^1 or d^9 electronic configurations, and (2) exchange-correlation-induced negative effective U in d^4 or d^6 electronic configurations, we propose a general rule and materials design of negative effective U system in itinerant (ionic and metallic) system for the realization of high-T_c superconductors. We design a T_c-enhancing layer (or clusters) of charge-excitation-induced negative effective $U$ connecting the superconducting layers for the realistic systems.

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