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Superconductividad inducida por presión y transición inusual de densidad de carga en forma de onda en Th₂Cu₄As₅

Yuqing Zhang¹, Ye Yang², Xikai Wen¹

¹Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society

|May 14, 2025

Resumen

La alta presión revela estados electrónicos complejos en Th₂Cu₄As₅. La superconductividad se mejora y luego se suprime mediante ondas de densidad de carga (CDW), con un nuevo estado de CDW que emerge a altas presiones.

Área de la Ciencia:

Física de la materia condensada
Ciencias de los materiales
Química del estado sólido

Sus antecedentes:

El material Th₂Cu₄As₅ exhibe órdenes de onda de superconductividad y densidad de carga (CDW).
Estos fenómenos pueden surgir de distintas unidades estructurales, ofreciendo una plataforma única para estudiar su interacción.

Objetivo del estudio:

Investigar la evolución del CDW y la superconductividad en Th₂Cu₄As₅ bajo alta presión.
Explorar la relación entre los estados de CDW inducidos por presión y la superconductividad.

Principales métodos:

Mediciones de transporte eléctrico a alta presión.
Mediciones de difracción de rayos X a alta presión.

Principales resultados:

La superconductividad inicialmente aumenta con la supresión de CDW, luego disminuye, mostrando un comportamiento similar a la cúpula.
Una nueva superred de 2 × 2 × 5, indicativa de un estado inusual de CDW, emerge por encima de 8 GPa.
Este nuevo estado CDW coincide con una pérdida repentina de superconductividad.

Conclusiones:

Th₂Cu₄As₅ muestra estados de CDW versátiles bajo presión.
Los hallazgos proporcionan una rara oportunidad para estudiar la interacción entre múltiples estados electrónicos ordenados.

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