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Superconductividad inducida por el campo magnético en el ferromagnético URhGe
1Département de Recherche Fondamentale sur la Matière Condensée, Service de Physique Statistique, Magnétique, et Supraconductivitié, Commissariat àl'Energie Atomique (CEA), Grenoble 38054, France.
Science (New York, N.Y.)
|August 27, 2005
Resumen
La superconductividad coexiste con el ferromagnetismo en URhGe. Una transición magnética, estimulada por excitaciones de rotación de espín cerca de una transición de fase cuántica, desencadena un nuevo estado superconductor bajo campos magnéticos altos.
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:
- La coexistencia de superconductividad y ferromagnetismo se observa en algunos metales por debajo de la temperatura de transición ferromagnética.
- Las características materiales subyacentes que impulsan esta coexistencia siguen siendo incompletamente comprendidas.
Objetivo del estudio:
- Investigar la interacción entre la superconductividad, el ferromagnetismo y los campos magnéticos en URhGe.
- Para aclarar los mecanismos detrás de la coexistencia de estos fenómenos.
Principales métodos:
- Se aplicaron altos campos magnéticos paralelos al eje del cristal b de URhGe.Ge.
- Transiciones magnéticas observadas y propiedades superconductoras bajo diferentes intensidades de campo magnético.
Principales resultados:
- Se identificó una transición magnética, que implica una reorientación del eje de giro, a las 12 teslas.
- Un estado superconductor secundario surgió en un rango de campo alrededor de esta transición magnética.
- Esta nueva bolsa superconductora existe por encima del campo inicial de 2 teslas donde se suprime la superconductividad.
Conclusiones:
- Las excitaciones de rotación de espín cerca de una transición de fase cuántica parecen estimular la superconductividad.
- Los campos magnéticos altos juegan un papel crucial en la modulación de la coexistencia de la superconductividad y el ferromagnetismo.
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