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Superconductividad en el semiconductor de brecha estrecha RbBi11/3Te6
Christos D Malliakas1, Duck Young Chung1, Helmut Claus1
1Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
Journal of the American Chemical Society
|October 18, 2016
Resumen
Los investigadores descubrieron superconductividad en RbBi11 / 3Te6, un nuevo material en capas con una brecha de banda estrecha. El ajuste químico aumentó su temperatura crítica (Tc) hasta un 10%, abriendo caminos para el desarrollo de nuevos superconductores.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Química del estado sólido
Sus antecedentes:
- La superconductividad es un fenómeno mecánico cuántico en el que un material exhibe resistencia eléctrica cero por debajo de una temperatura crítica.
- Los materiales en capas ofrecen propiedades electrónicas únicas debido a sus estructuras anisotrópicas.
- Descubrir nuevos compuestos superconductores es crucial para avanzar en tecnologías como la transmisión de energía y la levitación magnética.
Objetivo del estudio:
- Descubrir y caracterizar la superconductividad en el nuevo compuesto en capas RbBi11 / 3Te6.
- Investigar los efectos de la sustitución química en las propiedades superconductoras de este nuevo sistema de materiales.
- Establecer la serie homóloga y explorar su potencial para el desarrollo de nuevos superconductores.
Principales métodos:
- Síntesis de lingotes policristalinos y cristales únicos orientados de RbBi11/3Te6.
- Caracterización de las propiedades estructurales y electrónicas, incluida la medición del espacio entre bandas.
- Sustitución sistemática de Se y Sb para crear RbBi11/3-ySbySexTe6-x.
- Medición de la temperatura de transición superconductora (Tc) y de la fracción de volumen superconductora.
Principales resultados:
- Se descubrió superconductividad en RbBi11 / 3Te6 con una transición aguda a ~ 3,2 K.
- El material exhibe superconductividad a granel, confirmado por una fracción de volumen superconductora cercana al 100% en cristales individuales.
- Las sustituciones químicas (Se y Sb) demostraron la adaptabilidad de la transición superconductora, aumentando Tc hasta ~ 10%.
- RbBi11/3Te6 representa el primer miembro de una nueva serie homóloga Rb[Bi2n+11/3Te3n+6] con infinitas capas similares a Bi2Te3.
Conclusiones:
- RbBi11 / 3Te6 es un nuevo superconductor a granel que pertenece a una nueva serie homóloga.
- La estructura electrónica es químicamente sintonizable a través de dopaje y sustitución, ofreciendo una nueva familia de superconductores.
- Este descubrimiento proporciona una nueva plataforma para explorar y diseñar materiales superconductores con propiedades personalizadas.
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