JoVE - Journal of Visualized Experiments
JoVE Visualize
Contact Us
Esta página ha sido traducida por una máquina. Otras páginas pueden seguir apareciendo en inglés. View in English

Estructura de cristal quiral de baja temperatura y superconductividad en (Pt0.2 Ir0.8) Zr5

  • 0Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
Journal of the American Chemical Society +

|

27 de diciembre de 2023

|

27 de diciembre de 2023

Ver abstracta en PubMed

Resumen

Este resumen es generado por máquina.

Se observó superconductividad en quiral (Pt0.2Ir0.8) 3Zr5 a 2,2 K. Las mediciones de calor específico confirmaron la superconductividad en masa, obedeciendo el modelo de Bardeen-Cooper-Schrieffer, con la ruptura de par orbital dominante.

Área De La Ciencia

  • Física de la materia condensada
  • Ciencias de los materiales
  • La cristalografía

Sus Antecedentes

  • Las estructuras cristalinas quirales pueden influir en las propiedades electrónicas.
  • La superconductividad en compuestos intermetálicos es un área activa de investigación.
  • La comprensión de los mecanismos que limitan la superconductividad es crucial para el diseño de materiales.

Objetivo Del Estudio

  • Para investigar la superconductividad en el compuesto quiral (Pt0.2Ir0.8) 3Zr5.
  • Para determinar la naturaleza y la temperatura de transición de la superconductividad.
  • Para aclarar los mecanismos dominantes que rigen el estado superconductor.

Principales Métodos

  • Síntesis y caracterización de (Pt0.2Ir0.8) 3Zr5.
  • Mediciones específicas de calor para confirmar la superconductividad a granel.
  • Análisis de las propiedades superconductoras en relación con los modelos teóricos.

Principales Resultados

  • Superconductividad observada en (Pt0.2Ir0.8) 3Zr5 con una temperatura de transición de 2,2 K.
  • Superconductividad a granel confirmada mediante mediciones de calor específico.
  • El material sigue el modelo de acoplamiento débil Bardeen-Cooper-Schrieffer.
  • La ruptura de pares orbitales, no el límite de Pauli-Clogston, domina el campo crítico superior.

Conclusiones

  • El acoplamiento antisimétrico de espín-órbita en la estructura quiral no afecta significativamente la superconductividad.
  • (Pt0.2Ir0.8) 3Zr5 exhibe una superconductividad convencional de acoplamiento débil.
  • Los hallazgos contribuyen a comprender la superconductividad en materiales quirales.

Videos de Conceptos Relacionados

Superconductor 01:24

1.1K

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...

Ionic Crystal Structures 02:42

14.4K

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

Metallic Solids 02:37

18.4K

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Crystal Field Theory - Tetrahedral and Square Planar Complexes 02:46

42.6K

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

Crystal Field Theory - Octahedral Complexes 02:58

26.6K

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...