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Fluctuaciones dinámicas de la densidad de carga que impregnan el diagrama de fase de un superconductor de alta T a

R Arpaia^1,2, S Caprara^3,4, R Fumagalli⁵

¹Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy. riccardo.arpaia@chalmers.se giacomo.ghiringhelli@polimi.it.

Science (New York, N.Y.)

|August 31, 2019

Resumen

Las modulaciones de densidad de carga, cruciales en los superconductores de alta temperatura, se estudiaron en cupratos. Se encontró que las fluctuaciones dinámicas de corto alcance persisten por encima de la temperatura pseudogap, lo que afecta a las propiedades del material.

Área de la Ciencia:

Física de la materia condensada
Ciencias de los materiales

Sus antecedentes:

Las modulaciones de densidad de carga son una característica común en los cupratos superconductores de alta temperatura crítica (Tc).
Su papel en las propiedades inusuales de los cupratos con subdopaje a bajas temperaturas sigue sin estar claro.

Objetivo del estudio:

Investigar la dependencia de la temperatura de las modulaciones de densidad de carga en YBa2Cu3O7-δ y Nd1+xBaxCuO7-δ.
Comprender la influencia de estas modulaciones en el diagrama de fase complejo de los cupratos.

Principales métodos:

La dispersión de rayos X de resonancia se empleó para sondear las modulaciones de densidad de carga.
El estudio examinó múltiples niveles de dopaje en materiales específicos de cuprato.

Principales resultados:

Se identificaron dos tipos de modulaciones: ondas de densidad de carga cuasi-críticas y fluctuaciones dinámicas de densidad de carga de corto alcance.
Se observó que las fluctuaciones dinámicas persisten por encima de la temperatura de la pseudo brecha (T*).
Estas fluctuaciones poseen energías en el rango de milielectrones-voltios y están muy extendidas en todo el diagrama de fases.

Conclusiones:

Las fluctuaciones de densidad de carga dinámica de corto alcance son una característica significativa en los cupratos, que se extiende más allá de la temperatura pseudoespacio.
Estos hallazgos ofrecen nuevos conocimientos sobre la interacción entre las modulaciones de carga y las propiedades exóticas de los superconductores de alto Tc.

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