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Magnetorresistencia grande y no saturante en el WTe2
Mazhar N Ali1, Jun Xiong2, Steven Flynn1
1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
Nature
|September 16, 2014
Resumen
Los investigadores descubrieron una magnetorresistencia positiva extremadamente grande en WTe2, un material no magnético. Este hallazgo ofrece nuevas posibilidades para los sensores magnéticos y estudios fundamentales en física de materiales.
Área de la Ciencia:
- Física de los materiales Física de los materiales
- Física de la materia condensada Física de la materia condensada
Sus antecedentes:
- La magnetorresistencia, el cambio en la resistencia eléctrica debido a un campo magnético, es crucial para los sensores magnéticos y el almacenamiento de datos.
- Los materiales de gran magnetorresistencia son raros, lo que impulsa la investigación en la física de bajas temperaturas.
Objetivo del estudio:
- Informar sobre la observación de una magnetorresistencia positiva excepcionalmente alta en el WTe2.
- Investigar el potencial del WTe2 para nuevas aplicaciones electrónicas.
Principales métodos:
- Medición experimental de la resistencia eléctrica en WTe2 bajo temperaturas bajas variables y campos magnéticos altos.
- Caracterización del efecto de magnetorresistencia en un dicalcogenuro de metal de transición con capas no magnéticas.
Principales resultados:
- Se observó una magnetorresistencia positiva sin precedentes de 452,700% a 4.5 K (14.7 T) y 13 millones% a 0.53 K (60 T) en WTe2.
- La magnetorresistencia no mostró saturación ni siquiera en campos magnéticos extremadamente altos.
Conclusiones:
- WTe2 exhibe un extraordinario efecto de magnetorresistencia a bajas temperaturas.
- Este descubrimiento abre nuevas vías para la investigación en magnetorresistividad y el desarrollo de tecnologías avanzadas de sensores magnéticos.
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