Video Experimental Relacionado
Updated: Oct 7, 2025
10:42
Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10.8K
Pnictidos y chalcogenidos de hierro: un nuevo paradigma para la superconductividad
Rafael M Fernandes1, Amalia I Coldea2, Hong Ding3,4
1School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA. rfernand@umn.edu.
Nature
|January 6, 2022
Resumen
Los superconductores no convencionales, como los materiales a base de hierro, desafían las teorías convencionales. Sus complejas estructuras electrónicas ofrecen información sobre materiales cuánticos y fenómenos nuevos.
Área de la Ciencia:
- Física de la materia condensada
- Ciencia de los materiales cuánticos
Sus antecedentes:
- La superconductividad convencional en los metales se explica por la teoría de Bardeen-Cooper-Schrieffer.
- Los superconductores no convencionales, como los materiales a base de hierro, presentan fenómenos únicos que desafían la comprensión establecida.
Objetivo del estudio:
- Para explorar la naturaleza multifacética de los superconductores a base de hierro.
- Para entender cómo múltiples orbitales atómicos influyen en la superconductividad no convencional y las estructuras de brecha.
- Investigar fenómenos cuánticos relacionados, incluida la interacción de Hund, la nematicidad electrónica, las fluctuaciones magnéticas y la topología.
Principales métodos:
- El estudio sintetiza los conocimientos existentes sobre los superconductores a base de hierro.
- Revisa los marcos teóricos y los hallazgos experimentales.
- Se centra en la interacción de la estructura electrónica, el magnetismo y la superconductividad.
Principales resultados:
- Los superconductores basados en hierro exhiben diversas estructuras de hueco derivadas de múltiples orbitales atómicos.
- Estos materiales proporcionan información sobre la interacción de Hund, la nematicidad electrónica y la criticidad cuántica.
- Destacan el papel de la topología en estados electrónicos correlacionados.
Conclusiones:
- Los superconductores basados en hierro son cruciales para avanzar en la comprensión de los materiales cuánticos.
- Han impulsado el desarrollo de nuevos enfoques experimentales y teóricos.
- Su estudio tiene un impacto significativo en el campo más amplio de la física de la materia condensada.
Videos de Conceptos Relacionados
01:28Types Of Superconductors
1.2K
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...
1.2K
01:24Superconductor
1.3K
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...
1.3K
01:17Theory of Metallic Conduction
1.5K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.5K
01:31Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K
02:58Properties of Transition Metals
27.6K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
27.6K
02:37Metallic Solids
19.5K
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....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
19.5K