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Superconductividad de la estructura de sal de roca LaO Película delgada epitaxial
Kenichi Kaminaga1,2, Daichi Oka2, Tetsuya Hasegawa1
1Department of Chemistry , The University of Tokyo , Tokyo 113-0033 , Japan.
Journal of the American Chemical Society
|May 22, 2018
Resumen
Los investigadores descubrieron superconductividad en películas delgadas de oxicalcogenuro de lantano (LaO), alcanzando una temperatura de transición de 5 K. Este hallazgo desafía las tendencias existentes y sugiere LaO como un componente potencial para nuevos materiales superconductores.
Área de la Ciencia:
- Física del estado sólido
- Ciencias de los materiales
- Superconductividad
Sus antecedentes:
- Los monocalcogénidos de lantano (LaX) exhiben superconductividad con temperaturas de transición por debajo de 1,5 K.
- Las tendencias químicas existentes predicen temperaturas de transición más bajas para LaO en comparación con LaS, LaSe y LaTe.
Objetivo del estudio:
- Para investigar las propiedades superconductoras de las películas delgadas epitaxiales de LaO.
- Explorar la influencia de la densidad del portador y la tensión epitaxial en la superconductividad en LaO.
Principales métodos:
- Crecimiento epitaxial de película delgada de LaO.
- Medición de la temperatura de transición superconductora (Tc).
- Variación sistemática de la densidad del portador de electrones y de la tensión epitaxial.
Principales resultados:
- Se observó una temperatura de inicio de la transición superconductora (Tc) de aproximadamente 5 K en las películas de LaO.
- El Tc exhibió una dependencia en forma de cúpula de la densidad del portador de electrones.
- La tensión epitaxial tuvo un impacto significativo en Tc a pesar de la estructura cristalina altamente simétrica de LaO.
Conclusiones:
- La sal de roca LaO demuestra un Tc significativamente más alto que otros monocalcogénidos de lantano, desafiando las tendencias químicas.
- La sensibilidad de LaO a la tensión y la densidad del portador ofrece vías para afinar la superconductividad.
- El LaO superconductor sirve como un bloque de construcción prometedor para el diseño de nuevos superconductores de red.
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