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Orden orbital oculto en el metal férmion pesado URu(2) Si(2)

P Chandra¹, P Coleman, J A Mydosh

¹NEC, 4 Independence Way, Princeton, New Jersey 08540, USA.

|June 21, 2002

Resumen

Los investigadores proponen un orden oculto en el metal fermiónico pesado URu2Si2, identificándolo como el antiferromagnetismo orbital inconmensurado. Este hallazgo explica la anomalía de calor específico a 17 K y ofrece predicciones comprobables para experimentos de dispersión de neutrones.

Área de la Ciencia:

Física de la materia condensada Física de la materia condensada
Ciencia de los materiales cuánticos Ciencia de los materiales cuánticos.

Sus antecedentes:

Las inestabilidades colectivas en la materia enfriada a altas temperaturas conducen a nuevos estados ordenados, a menudo señalados por anomalías de calor específicas.
El metal férmion pesado Uranio Rutenio Silicuro (URu2Si2) exhibe una aguda anomalía de calor específico a 17 K, pero el orden subyacente ha permanecido esquivo durante más de 17 años.

Objetivo del estudio:

Proponer e investigar la naturaleza del orden oculto en URu2Si2.2.
Para explicar la anomalía de calor específico observada y los fenómenos asociados a 17 K.

Principales métodos:

Modelado teórico de sistemas de fermiones pesados.
Análisis de la repulsión electrón-electrón y las fluctuaciones antiferromagnéticas.
Propuesta de antiferromagnetismo orbital inconmensurado con corrientes circulantes.

Principales resultados:

El antiferromagnetismo orbital inconmensurado propuesto puede explicar los campos locales y la pérdida de entropía en la transición de 17 K en URu2Si2.
Se favorece un fluido de electrones pesados casi incompresible con estados de cuasipartículas pareadas anisotrópicamente.

Conclusiones:

El antiferromagnetismo orbital desproporcionado es un fuerte candidato para el orden oculto en URu2Si2.2.
Se proporcionan predicciones detalladas para los experimentos de dispersión de neutrones para verificar experimentalmente esta propuesta.

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