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La interacción omnipresente entre el ordenamiento de la carga y la superconductividad a alta temperatura en cuprates
Eduardo H da Silva Neto1, Pegor Aynajian, Alex Frano
1Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, USA.
Science (New York, N.Y.)
|December 21, 2013
Resumen
El ordenamiento de la carga, un fenómeno que compite con la superconductividad en los materiales de óxido de cobre, se observó en Bi2Sr2CaCu2O ((8+x). Este hallazgo sugiere una organización de carga similar en diferentes familias de cupratos, potencialmente vinculada al comportamiento dopado del aislador Mott.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
- Química del estado sólido.
Sus antecedentes:
- Los superconductores de alta temperatura de óxido de cobre (cuprato) exhiben comportamientos electrónicos complejos más allá de la superconductividad.
- El ordenamiento de la carga es otro fenómeno frecuente en estos materiales, que a menudo compite con el estado superconductor.
Objetivo del estudio:
- Para investigar la formación y las características del ordenamiento de la carga en el superconductor de alta temperatura Bi2Sr2CaCu2O ((8+x)).
- Para comparar la orden de carga observada con la encontrada en otras familias de cupratos (basadas en Y y basadas en La).
- Comprender la relación entre el ordenamiento de la carga y la superconductividad en cupratos.
Principales métodos:
- Microscopía de túnel de barrido (STM, por sus siglas en inglés) para la obtención de imágenes en el espacio real del ordenamiento de la carga.
- Diseminación de rayos X elástica resonante (REXS) para sondear la periodicidad de orden de carga.
- Mediciones espectroscópicas para identificar firmas electrónicas de ordenamiento de cargas.
Principales resultados:
- Se estableció el orden de formación de la carga en Bi2Sr2CaCu2O(8+x), con periodicidad dependiente de la concentración del agujero.
- Se ha demostrado una competencia análoga entre el ordenamiento de la carga y la superconductividad, similar a los cupratos basados en Y y La.
- Se observó una distintiva firma asimétrica de agujero de electrones y una resonancia a +20 meV en datos espectroscópicos, indicativos de la organización del agujero en un aislante Mott dopado.
Conclusiones:
- La organización de la carga compite con la superconductividad en diferentes familias de cupratos.
- El orden de carga observado en Bi2Sr2CaCu2O ((8+x) está probablemente relacionado con la estructura electrónica de un aislante Mott dopado.
- Estos hallazgos ponen de relieve un mecanismo común que subyace al ordenamiento de la carga en los superconductores de alta temperatura.
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