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Fases electrónicamente blandas en las manganitas.

G C Milward1, M J Calderón, P B Littlewood

  • 1Cavendish Laboratory, Cambridge University, Madingley Road, Cambridge CB3 0HE, UK. gcm24@cam.ac.uk

Nature
|February 11, 2005
PubMed
Resumen
Este resumen es generado por máquina.

La colosal magnetorresistencia en las manganitas surge de fases que compiten entre sí. Una nueva investigación muestra que la modulación magnética y de carga pueden coexistir en nuevas fases termodinámicas, desafiando los modelos anteriores.

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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.

Sus antecedentes:

  • La magnetorresistencia colosal (CMR) en las manganitas se atribuye típicamente a la separación de fase entre los estados ferromagnéticos metálicos y los aislantes modulados por carga.
  • Se han observado fases complejas que exhiben la coexistencia de parámetros de orden de modulación magnética y de carga en diagramas de fase de manganita.

Objetivo del estudio:

  • Explicar la coexistencia de la modulación magnética y de carga en las manganitas utilizando una teoría fenomenológica de Ginzburg-Landau.
  • Proponer una reinterpretación de la modulación de carga como un fenómeno extendido de "onda de densidad de carga".

Principales métodos:

  • Desarrollo y aplicación de una teoría fenomenológica Ginzburg-Landau.
  • Análisis de diagramas de fase y coexistencia de parámetros de orden.

Principales resultados:

  • La teoría de Ginzburg-Landau explica con éxito la coexistencia de la modulación magnética y de carga en las nuevas fases termodinámicas.
  • El modelo predice un rico diagrama de fases de equilibrio, consistente con las observaciones experimentales.
  • Los hallazgos sugieren que la modulación de carga en las manganitas se describe mejor como una onda de densidad de carga.

Conclusiones:

  • La coexistencia de la modulación magnética y de carga en las manganitas surge de las nuevas fases de equilibrio termodinámico, no sólo de desorden o de tensión.
  • Este trabajo requiere una reevaluación de la modulación de carga en estos materiales hacia un modelo de onda de densidad de carga.
  • Los principios de simetría impulsada por la coexistencia de órdenes competidoras pueden ser aplicables a otros sistemas electrónicos correlacionados.