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La transición aislador-metal inducida por corriente y la formación de patrones en un complejo orgánico de
1Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan. Department of Applied Physics, University of Tokyo, Tokyo 113-0033, Japan.
Science (New York, N.Y.)
|June 5, 1999
Resumen
Los aislantes moleculares orgánicos Mott exhiben una conducción eléctrica no lineal bajo campos eléctricos altos. Un estado de baja resistencia en el potasio 7,7,8,8-tetracianoquinodimetano reveló la segregación de fase inducida por corriente.
Área de la Ciencia:
- Física del estado sólido Física del estado sólido
- Ciencia de los materiales Ciencia de los materiales.
- Electrónica orgánica y electrónica orgánica.
Sus antecedentes:
- Los aislantes moleculares orgánicos Mott cuentan con una localización de la portadora impulsada por la correlación de electrones.
- Estos materiales pueden exhibir propiedades eléctricas no lineales bajo condiciones específicas.
Objetivo del estudio:
- Para investigar la conducción eléctrica no lineal en aislantes orgánicos moleculares Mott.
- Para caracterizar el estado de baja resistencia inducido por la corriente en el potasio 7,7,8,8-tetracianoquinodimetano.
Principales métodos:
- Aplicación de campos eléctricos altos a lo largo del eje de apilamiento molecular.
- Observación de los estados impulsados por la corriente hasta 2 Kelvin.
- Visualización microscópica de las vías conductoras y la segregación de fases.
Principales resultados:
- Se observó una conducción eléctrica no lineal en aislantes orgánicos moleculares Mott.
- Se logró un estado estable y de baja resistencia en potasio 7,7,8,8-tetracianoquinodimetano a bajas temperaturas.
- El flujo de corriente indujo una segregación de fase en forma de franjas en regiones ricas en portadores y pobres en portadores.
Conclusiones:
- La correlación de electrones en los aislantes Mott moleculares orgánicos conduce a comportamientos eléctricos únicos.
- La segregación de fase inducida por corriente es un mecanismo clave para el estado de baja resistencia observado.
- Estos hallazgos ofrecen información sobre el control de las propiedades electrónicas en materiales orgánicos correlacionados.
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