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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Resumen

Los investigadores sintetizaron niquelados de capa infinita sin defectos, revelando propiedades de estado normal similares a los óxidos de cobre. Este avance mejora la superconductividad en los niquelados, lo que sugiere una convergencia entre estas familias superconductoras.

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Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales
  • Superconductividad

Sus antecedentes:

  • La superconductividad cerca de fases fuertemente correlacionadas es clave para comprender los fenómenos emergentes.
  • Los niquelados en capas son prometedores para la superconductividad, pero las limitaciones de los materiales dificultan la investigación.
  • Los defectos en las películas de níquel infinito complican las mediciones de transporte.

Objetivo del estudio:

  • Para superar las limitaciones de los materiales en los niquelados de capa infinita.
  • Para investigar las propiedades del estado normal de los niquelados libres de defectos.
  • Para entender la relación entre los defectos y la superconductividad en los niquelados.

Principales métodos:

  • Las películas delgadas de Nd1-xSrxNiO2 sintetizadas en un nuevo sustrato ((LaAlO3) 0.3 ((Sr2TaAlO6) 0.7).
  • Se ha logrado una síntesis esencialmente libre de defectos extendidos.
  • Se han realizado mediciones de transporte en la serie de niquelato con mínimo defectos.

Principales resultados:

  • Los niquelados libres de defectos exhiben comportamientos de resistividad de estado normal distintos (reversión, lineal, cuadrática) en todos los niveles de dopaje.
  • Se han observado similitudes fenomenológicas con los óxidos de cobre, a pesar de las diferencias en la estructura electrónica.
  • Temperatura de transición superconductora mejorada y rango de dopaje en niquelados minimizados por defectos.

Conclusiones:

  • La reducción del desorden en los niquelados revela propiedades electrónicas convergentes con los óxidos de cobre.
  • El nuevo sustrato permite la síntesis de níquel de alta calidad en capas infinitas.
  • Estos hallazgos allanan el camino para una comprensión más profunda de la superconductividad del niquelato.