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Superconductividad a base de plutonio con una temperatura de transición por encima de 18 K.

J L Sarrao1, L A Morales, J D Thompson

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. sarrao@lanl.gov

Nature
|November 26, 2002
PubMed
Resumen

La superconductividad fue descubierta en el plutonio cobalto de galio (PuCoGa5), vinculado al plutonio.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales Ciencia de los materiales.
  • La mecánica cuántica es la mecánica cuántica.

Sus antecedentes:

  • La estructura electrónica del plutonio, particularmente sus electrones 5f, es poco conocida y difícil de modelar.
  • Las propiedades electrónicas del plutonio son fundamentales para su comportamiento metalúrgico y sus aplicaciones tecnológicas.
  • Comprender la estructura electrónica del plutonio es clave para avanzar en la ciencia de los materiales y la mecánica cuántica.

Objetivo del estudio:

  • Para investigar las propiedades electrónicas del plutonio.
  • Descubrir nuevos fenómenos relacionados con el estado electrónico único del plutonio.
  • Explorar posibles vínculos entre la estructura electrónica del plutonio y la superconductividad.

Principales métodos:

  • Síntesis experimental y caracterización de PuCoGa5.5.
  • Medición de la temperatura de transición de superconductividad (Tc) y la corriente crítica.
  • Análisis teórico de la estructura electrónica y su relación con la superconductividad.

Principales resultados:

  • Se descubrió superconductividad en PuCoGa5 con una temperatura de transición (Tc) de aproximadamente 18,5 K.
  • La superconductividad se atribuye a las propiedades electrónicas anómalas del plutonio.
  • PuCoGa5 exhibe una gran corriente crítica debido a los centros de fijación inducidos por la radiación.

Conclusiones:

  • PuCoGa5 representa una nueva clase de superconductores mediados por la fluctuación de espín.
  • Sus puentes de alto Tc con fermiones pesados y superconductores de óxido de cobre de alto Tc.
  • Los hallazgos ofrecen información sobre los mecanismos de superconductividad no convencionales y el comportamiento electrónico del plutonio.