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Imágenes de los vórtices de josephson de la capa intermedia en Tl2Ba2CuO6+delta
1K. A. Moler, Department of Physics, Princeton University, Princeton, NJ 08544, USA. J. R. Kirtley, IBM T. J. Watson Research Center, Post Office Box 218, Yorktown Heights, NY 10598, USA. D. G. Hinks and T. W. Li, Materials Science Division, Argonne Nat.
Science (New York, N.Y.)
|March 4, 1998
Resumen
Los investigadores midieron el túnel de Josephson de la capa intermedia en un superconductor de alta temperatura utilizando un microscopio de exploración SQUID. Los resultados mostraron que la profundidad de penetración entre capas era significativamente mayor de lo previsto por el modelo de túneles entre capas.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
- La superconductividad es la superconductividad.
Sus antecedentes:
- El túnel de Josephson entre capas es crucial para comprender los mecanismos de superconductividad en materiales en capas.
- Los superconductores de alta temperatura de transición con un solo plano de óxido de cobre ofrecen propiedades únicas para el estudio.
Objetivo del estudio:
- Para medir directamente la resistencia del túnel entre capas en Tl2Ba2CuO6+delta.
- Para probar la validez del modelo de túneles entre capas en un superconductor de alta temperatura de transición.
Principales métodos:
- Utilizó un microscopio de escaneo de dispositivo de interferencia cuántica superconductor (SQUID). microscopio.
- Imagen de la capa intermedia de los vórtices de Josephson para cuantificar el túnel.
Principales resultados:
- La profundidad de penetración entre capas (lambdac) se midió en aproximadamente 20 micrómetros.
- Esta profundidad medida es aproximadamente 20 veces mayor que la predicha por el modelo de túneles entre capas.
Conclusiones:
- Los hallazgos desafían el modelo estándar de túneles entre capas como el único mecanismo de superconductividad en este material.
- Se necesitan más investigaciones teóricas y experimentales para explicar la discrepancia observada en el túnel de capa intermedia.
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