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Dependencia de la temperatura de la anisotropía de la brecha superconductora en Bi2Sr2CaCu2O8+x
Science (New York, N.Y.)
|February 10, 1995
Resumen
La brecha superconductora en Bi(2)Sr(2)CaCu(2)O(8+x) muestra una inusual anisotropía dependiente de la temperatura. Este hallazgo desafía los modelos simples de ondas d para los superconductores de alta temperatura.
Área de la Ciencia:
- La superconductividad es la superconductividad.
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Bi(2)Sr(2)CaCu(2)O(8+x) es un superconductor cuprato con una estructura electrónica compleja.
- Comprender la dependencia de temperatura de la brecha superconductora es crucial para elucidar los mecanismos de emparejamiento.
Objetivo del estudio:
- Para investigar la dependencia de la temperatura resuelta por el momento de la brecha superconductora en Bi(2)Sr(2)CaCu(2)O(8+x).
- Para comparar el comportamiento observado con superconductores convencionales anisotrópicos y modelos teóricos.
Principales métodos:
- Espectroscopia de fotoemisión con resolución de ángulo de alta resolución (ARPES).
- Análisis del tamaño de la brecha superconductora y la intensidad del peso espectral del condensado.
Principales resultados:
- La anisotropía de la brecha superconductora entre las direcciones Gamma-M y Gamma-X aumenta con la temperatura.
- La brecha a lo largo de la dirección Gamma-X disminuye a cero a temperaturas donde la brecha a lo largo de la dirección Gamma-M sigue siendo significativa.
- Estas observaciones son contrarias a los superconductores anisotrópicos convencionales.
Conclusiones:
- La dependencia de temperatura de la brecha superconductora en Bi(2)Sr(2)CaCu(2)O(8+x) es anómala.
- Los datos proporcionan una fuerte evidencia en contra de la forma más simple del parámetro de orden superconductor de onda d.
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