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Polarización de espín gigante y un par de espines antiparalelo en un superconductor quiral
R Nakajima1,2, D Hirobe3,4,5,6, G Kawaguchi1
1Institute for Molecular Science, Myodaiji, Okazaki, Japan.
Nature
|January 18, 2023
Resumen
Se observó la selectividad de espín inducida por la quiralidad en superconductores orgánicos, demostrando interacciones espín-órbita y espines polarizados de manera opuesta. Este hallazgo ofrece información sobre la selectividad del espín molecular y los avances de la espintrónica superconductora.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- La tecnología Spintronics
Sus antecedentes:
- Las moléculas quirales exhiben selectividad de espín inducida por quiralidad (CISS), un fenómeno en el que la polarización de espín puede exceder a la de los ferromagnetos.
- Las aplicaciones potenciales se encuentran en el campo emergente de la espintrónica quiral.
- El origen preciso del CISS sigue sin estar claro, con mecanismos propuestos que incluyen interacciones de espín-órbita mejoradas y pares de espín polarizados de manera opuesta.
Objetivo del estudio:
- Verificar experimentalmente los orígenes microscópicos propuestos de la selectividad del espín inducida por la quiralidad.
- Para investigar estos fenómenos en un sistema de estado sólido, específicamente un superconductor quiral orgánico.
- Explorar el potencial de generación de corriente de espín en la espintrónica superconductora.
Principales métodos:
- Las mediciones de magnetorresistencia se realizaron cerca de la temperatura de transición superconductora de un superconductor quiral orgánico.
- Se realizó un mapeo espacial de la polaridad de espín bajo excitación de corriente alterna para demostrar pares de espín polarizados de manera opuesta.
Principales resultados:
- Se logró la observación simultánea de interacciones de espín-órbita mejoradas y pares de espín polarizados de manera opuesta.
- La polarización de espín medida excedió significativamente la predicha por el efecto Edelstein, confirmando interacciones de espín-órbita mejoradas.
- Se demostró un análogo en estado sólido de las acumulaciones de espín observadas en moléculas quirales.
Conclusiones:
- El estudio proporciona evidencia experimental para los mecanismos propuestos que subyacen a la selectividad de espín inducida por la quiralidad en un sistema de estado sólido.
- Estos hallazgos pueden aclarar el origen del CISS en los sistemas moleculares.
- Se espera que la capacidad demostrada de suministro de corriente de espín estimule la investigación en espíntrónica superconductora.
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