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La superconductividad bidimensional surgió en la red cuadrada monoatómica Bi2O2Bi a través de la incorporación de
Ryosuke Sei1,2, Suguru Kitani3, Tomoteru Fukumura2
1Department of Chemistry, Graduate School of Science, The University of Tokyo , Tokyo 113-0033, Japan.
Journal of the American Chemical Society
|August 20, 2016
Resumen
Los investigadores descubrieron superconductividad bidimensional en Y2O2Bi a 2 K. Esta nueva superconductividad surge en compuestos incorporados de oxígeno, lo que sugiere la incorporación de elementos como una nueva ruta para encontrar superconductores.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Química del estado sólido
Sus antecedentes:
- Los superconductores en capas como los cupratos y los compuestos a base de hierro son cruciales para el descubrimiento científico.
- Las capas casi bidimensionales con cationes metálicos de transición son clave para la superconductividad, a menudo lograda a través de la sustitución de iones aliovalentes.
- El dopaje de portadores en estas estructuras en capas es un mecanismo principal para lograr la superconductividad.
Objetivo del estudio:
- Para reportar el descubrimiento de superconductividad bidimensional en un nuevo óxido en capas, Y2O2Bi.
- Investigar el papel de la incorporación de oxígeno y las modificaciones estructurales en la superconductividad en Y2O2Bi.
- Explorar un nuevo enfoque para el descubrimiento de superconductores mediante la incorporación de elementos en sitios intersticiales.
Principales métodos:
- Síntesis de óxido en capas tipo ThCr2Si2 Y2O2Bi.
- Incorporación controlada de oxígeno en la estructura de Y2O2Bi.
- Investigación de los cambios estructurales, específicamente la expansión de la distancia entre redes.
- Mediciones de la resistividad eléctrica para detectar la superconductividad a bajas temperaturas (2 K).
Principales resultados:
- Descubrimiento de la superconductividad bidimensional a 2 K en Y2O2Bi.
- La superconductividad se observó solo en muestras incorporadas de oxígeno, no en Y2O2Bi prístino.
- La incorporación de oxígeno condujo a una mayor distancia entre las redes en la estructura Y2O2Bi.
- La red cuadrada monatómica conductora Bi(2-) está potencialmente vinculada a la superconductividad exótica.
Conclusiones:
- La incorporación de elementos en sitios intersticiales es una estrategia alternativa viable para el descubrimiento de nuevos superconductores.
- Los resultados ponen de relieve la importancia de las modificaciones estructurales, como la distancia entre redes, para lograr la superconductividad.
- Este trabajo abre nuevas vías para explorar la superconductividad exótica en materiales en capas.
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