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Observación de supercorrientes a través de las fronteras de grano en películas YBaCuO con resolución espacial
Science (New York, N.Y.)
|August 25, 1989
Resumen
Los límites de grano limitan la densidad de corriente crítica en los superconductores de óxido de cobre yttrio bario (YBa(2) Cu(3) O(7). Los complejos patrones de transporte de corriente observados en los límites de grano se correlacionan con estructuras inexplicables de sub-brecha en las características de voltaje.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Física de la materia condensada Física de la materia condensada
- La superconductividad es la superconductividad.
Sus antecedentes:
- Se sabe que los límites de grano impiden el flujo de corriente en los superconductores policristalinos.
- Comprender estas limitaciones es crucial para desarrollar materiales superconductores de alto rendimiento.
- El óxido de cobre de bario yttrio (YBa(2)Cu(3)O(7) es un superconductor de alta temperatura con aplicaciones potenciales.
Objetivo del estudio:
- Para resolver espacialmente el transporte de corriente a través de los límites de grano individuales en YBa(2)Cu(3)O(7).
- Para identificar directamente el papel de los límites de grano en la limitación de la densidad crítica de corriente.
- Investigar el origen de complejos patrones de transporte de corriente y su relación con las características eléctricas observadas.
Principales métodos:
- Medidas de resistividad con resolución espacial.
- Microscopía electrónica de barrido a baja temperatura (LT-SEM) con una resolución de 1 a 2 micrómetros.
- Análisis de las características de corriente-voltaje.
Principales resultados:
- Observación directa de las limitaciones actuales de transporte impuestas por los límites de los granos.
- Identificación de complejos patrones de distribución de corriente espacial a través de las fronteras de grano.
- Correlación entre los patrones observados y las resonancias autoexcitadas.
- Enlace de estas resonancias con la "estructura de sub-brecha" en el YBa polycrystalline ((2) Cu ((3) O ((7).
Conclusiones:
- Los límites de grano limitan significativamente la densidad de corriente crítica en los superconductores YBa(2)Cu(3)O(7).
- Los patrones complejos de corriente observados se atribuyen a resonancias autoexcitadas dentro de los límites de los granos.
- Estas resonancias proporcionan una explicación potencial para la "estructura de sub-brecha" en el YBa polycrystalline (((2) Cu (((3) O ((7).
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