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Magnetic Tweezers for the Measurement of Twist and Torque
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Magnetorresistencia angular singular en un semimetal nódulo magnético
Resumen
Descubrimos una singular magnetorresistencia angular (SAMR) en el cerio-aluminio-germanio (CeAlGe), un semimetal magnético de Weyl. Este fenómeno señala una ruptura de simetría espontánea y puede ajustarse por la composición del material.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- Física del estado sólido
Sus antecedentes:
- Los coeficientes de transporte revelan las fases ocultas en los sistemas de electrones correlacionados.
- Los semimetales magnéticos de Weyl exhiben propiedades electrónicas únicas.
Objetivo del estudio:
- Identificar una firma de transporte de ruptura de simetría espontánea en el sistema CeAlGe.
- Investigar la sintonizabilidad de esta firma mediante la sustitución isoelectrónica.
Principales métodos:
- Medición experimental de los coeficientes de transporte.
- Explicación teórica de los fenómenos observados.
- Sustitución parcial de silicio por germanio por medio de la isoelectrónica.
Principales resultados:
- Observación de la magnetorresistencia angular singular (SAMR, por sus siglas en inglés) superior al 1000% por radian.
- SAMR limitado a ejes de alta simetría con un ancho estrecho (<1°).
- SAMR sintonizable mediante la sustitución de germanio por silicio.
Conclusiones:
- SAMR es una firma de ruptura de simetría de grupo de puntos magnéticos espontáneos en CeAlGe.
- Las paredes de dominio de alta resistencia controlables son responsables de la SAMR.
- Las simetrías de la red y el sitio se pueden diseñar para una alta sensibilidad angular en materiales magnéticos.
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