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Nematicidad electrónica impulsada por la densidad de carga en un superconductor kagome
Linpeng Nie1, Kuanglv Sun1, Wanru Ma2
1Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China.
Nature
|February 9, 2022
Resumen
La nematicidad electrónica, una simetría rotacional rota, se encuentra en CsV3Sb5. Este descubrimiento revela la nematicidad electrónica intrínseca en el estado normal, que afecta a los superconductores no convencionales.
Área de la Ciencia:
- Física de la materia condensada
- Los materiales cuánticos
Sus antecedentes:
- La nematicidad electrónica es un fenómeno en el que los grados de libertad electrónicos rompen la simetría rotacional.
- Se observa en fluidos cuánticos como los superconductores de alta temperatura y los sistemas cuánticos Hall.
- La interacción entre la nematicidad electrónica, la superconductividad y el orden carga-densidad-onda (CDW) en los materiales AV3Sb5 no se entiende bien.
Objetivo del estudio:
- Investigar la presencia y la naturaleza de la nematicidad electrónica en CsV3Sb5.
- Comprender la relación entre el orden del CDW y la potencial nematicidad en este material.
- Explorar las implicaciones de la nematicidad electrónica para los mecanismos de superconductividad.
Principales métodos:
- Medidas de la resistencia al lastre para detectar cambios en la resistencia debidos a la tensión.
- Espectroscopia de resonancia magnética nuclear (RMN) para sondear entornos magnéticos y electrónicos locales.
- Microscopía/espectroscopia de túnel de barrido (STM/S) para la visualización a escala atómica de la estructura y el orden electrónicos.
Principales resultados:
- Se encontró evidencia de nematicidad electrónica en CsV3Sb5, distinta de una distorsión estructural C2 observada anteriormente.
- Las fluctuaciones nemáticas surgen por debajo de la temperatura de transición CDW (~ 94 K), con una transición nemática distinta que ocurre alrededor de 35 K.
- STM / S visualizó directamente el orden nemático de largo alcance, lo que sugiere una nueva nematicidad potencialmente descrita por un modelo de Potts de tres estados.
Conclusiones:
- CsV3Sb5 exhibe nematicidad electrónica intrínseca en su estado normal.
- Este hallazgo establece un nuevo paradigma para comprender el papel de la nematicidad electrónica en superconductores no convencionales.
- La interacción entre el orden de CDW, la nematicidad y la superconductividad en CsV3Sb5 justifica una investigación adicional.
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