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La división inducida por la presión y el doblamiento de las cadenas de Cu-O en la estructura de baja dimensión de
Fuxiang Zhang1, Jianwei Wang, Udo Becker
1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA.
Journal of the American Chemical Society
|October 25, 2007
Resumen
La alta presión hace que las cadenas de óxido de cobre de estroncio (SrCuO2) se dividan y se abren, formando un nuevo material más denso. Esta fase de alta presión es una superestructura, no es estable en condiciones normales.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Física del estado sólido Física del estado sólido
- Investigaciones de alta presión.
Sus antecedentes:
- El óxido de cobre de estroncio (SrCuO2) es conocido por su fase superconductora tetragonal de capas infinitas.
- Comprender el comportamiento de los materiales en condiciones extremas es crucial para descubrir nuevas propiedades.
Objetivo del estudio:
- Para investigar los cambios estructurales en el SrCuO2 bajo alta presión.
- Para caracterizar las fases de alta presión de SrCuO2.2.
Principales métodos:
- Experimentos de alta presión de más de 7 GPa.
- Análisis estructural a temperatura ambiente.
Principales resultados:
- Se observa la escisión inducida por presión de las cadenas de Cu-O en SrCuO2 por encima de 7 GPa.
- Formación de una superestructura de la fase superconductora tetragonal.
- Las cadenas de Cu-O se abren con el aumento de la presión, lo que lleva a una nueva polimorfa de alta densidad a 34,2 GPa.
Conclusiones:
- El SrCuO2 sufre transformaciones estructurales significativas bajo alta presión.
- Las fases de alta presión son distintas de la fase superconductora ambiental y no son estables en condiciones normales.
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