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La transición entre las fases de parámetro de orden superconductor real y complejo en UPt3
J D Strand1, D J Bahr, D J Van Harlingen
1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. strand2@illinois.edu
Science (New York, N.Y.)
|June 12, 2010
Resumen
Los investigadores mapearon el parámetro de orden superconductor en UPt3 utilizando las uniones de Josephson. Encontraron simetrías distintas en las fases superconductoras de alta temperatura y baja temperatura, revelando un complejo parámetro de orden en esta última.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- Investigación de la superconductividad Investigación de la superconductividad
Sus antecedentes:
- La simetría de parámetros de orden es fundamental para comprender los superconductores.
- Los compuestos de fermiones pesados como UPt3 exhiben comportamientos electrónicos complejos y múltiples fases superconductoras.
- Se sabe que UPt3 posee distintas fases superconductoras con diferentes simetrías.
Objetivo del estudio:
- Para investigar la simetría del parámetro de orden superconductor en UPt3.
- Para mapear la magnitud del parámetro de orden superconductor a través de diferentes direcciones y temperaturas del espacio de momento.
- Caracterizar las diferencias entre las fases superconductoras de alta y baja temperatura de UPt3.
Principales métodos:
- Fabricación de las uniones del túnel de Josephson en superficies de cristal único UPt3.
- Medición de la corriente crítica en las uniones de Josephson.
- Mapeo de la magnitud del parámetro del orden superconductor en función de la dirección y la temperatura.
Principales resultados:
- Observación de un nodo agudo en el hueco superconductor a 45 grados con respecto al eje a en la fase de alta temperatura.
- Detección de un componente fuera de fase en la fase de baja temperatura.
- Evidencia de un complejo parámetro de orden superconductor en la fase de baja temperatura.
Conclusiones:
- El estudio revela distintas simetrías de parámetros de orden superconductores en UPt3.
- Los hallazgos destacan la naturaleza compleja de la superconductividad en los compuestos de fermiones pesados.
- UPt3 sirve como un sistema crucial para explorar la interacción de las órdenes electrónicas y la superconductividad.
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