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La evidencia para el comportamiento crítico cuántico en el cuprato dopado óptimamente Bi(2)Sr(2)CaCu(2)O(8+delta)

Valla¹, Fedorov, Johnson

¹Department of Physics, National Synchrotron Light Source, Division of Materials Sciences, Brookhaven National Laboratory, Upton, NY 11973-5000, USA. Department of Physics, University of Connecticut, Storrs, CT 06269, USA. School of Physics, The.

Science (New York, N.Y.)

|September 25, 1999

Resumen

La espectroscopia de fotoemisión de alta resolución revela que los estados nodales en los superconductores de cuprato no influyen en la superconductividad. El escalamiento dependiente de la temperatura sugiere un comportamiento crítico cuántico en Bi(2)Sr(2)CaCu(2)O(8+delta).

Área de la Ciencia:

Física de la materia condensada Física de la materia condensada
Ciencia de los materiales Ciencia de los materiales.
Materiales Cuánticos Los materiales cuánticos son los materiales cuánticos.

Sus antecedentes:

Los superconductores de cuprato exhiben complejas propiedades electrónicas cruciales para la comprensión de la superconductividad a alta temperatura.
El papel de los estados nodales en el mecanismo superconductor sigue siendo un área clave de investigación.

Objetivo del estudio:

Para investigar las propiedades electrónicas de Bi(2)Sr(2)CaCu(2)O(8+delta) dopajeado de manera óptima cerca de la transición superconductora.
Para determinar la influencia de los estados nodales en la superconductividad en cupratos.

Principales métodos:

Utilizando espectroscopia de fotoemisión de muy alta resolución.
Analizando las formas de las líneas de fotoemisión a lo largo de la dirección nodal del parámetro de orden superconductor.

Principales resultados:

Se observó una dependencia lineal de la temperatura de la anchura del pico (tiempo de vida inverso) a pequeñas energías, independientemente de la energía de unión.
Encontró una dependencia lineal de energía del ancho de pico en grandes energías de unión, independientemente de la temperatura.
Se demostró que estos comportamientos no se ven afectados por la transición superconductora.

Conclusiones:

Los estados nodales parecen desempeñar un papel insignificante en la superconductividad de Bi(2)Sr(2)CaCu(2)O(8+delta).
El escalamiento dependiente de la temperatura indica la presencia de comportamiento crítico cuántico en el sistema estudiado.
Los hallazgos proporcionan información sobre los mecanismos fundamentales de la superconductividad a alta temperatura.

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