Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.9K
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...
26.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

43.1K
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,...
43.1K
Colors and Magnetism03:02

Colors and Magnetism

12.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.0K
Valence Bond Theory02:42

Valence Bond Theory

8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.8K
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

42.5K
Effect of Lone Pairs of Electrons on Molecule Geometry
42.5K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

2.6K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
2.6K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Excitonic spin torque in a magnetic semiconductor.

Nature materials·2026
Same author

Author Correction: Hidden states and dynamics of fractional fillings in twisted MoTe<sub>2</sub> bilayers.

Nature·2026
Same author

Correction to "Macroscopic Transition Metal Dichalcogenide Monolayers from Gold-Tape Exfoliation Retain Intrinsic Properties".

Nano letters·2026
Same author

Observation of coherent ferron emission and propagation.

Nature materials·2026
Same author

Purcell enhancement of directional edge photocurrent in a van der Waals self-cavity.

Nature communications·2026
Same author

Angle evolution of the superconducting phase diagram in twisted bilayer WSe<sub>2</sub>.

Nature·2026

Video Experimental Relacionado

Updated: Jul 25, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

14.7K

Orden de las ondas por densidad de pares en EuRbFe4As4

He Zhao1, Raymond Blackwell1, Morgan Thinel2,3

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, USA.

Nature
|June 28, 2023
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores descubrieron un nuevo estado de onda de densidad de par de campo cero (PDW) en el superconductor EuRbFe4As4. Este estado exhibe modulaciones de brecha superconductoras únicas, independientes de otros estados ordenados, que ofrecen nuevas ideas sobre la superconductividad no convencional.

Más Videos Relacionados

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
07:24

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

6.1K
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

17.7K

Videos de Experimentos Relacionados

Last Updated: Jul 25, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

14.7K
Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
07:24

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

6.1K
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

17.7K

Área de la Ciencia:

  • Física de la materia condensada
  • Investigación de la superconductividad
  • Ciencias de los materiales

Sus antecedentes:

  • Una onda de densidad de par (PDW) es un estado superconductor que rompe la simetría de traslación.
  • La evidencia anterior de PDW se limitaba a campos magnéticos altos o coexistiendo con otras órdenes.
  • Un PDW de campo cero, independiente de otros estados, seguía siendo elusivo.

Objetivo del estudio:

  • Para investigar la existencia de un estado primario de onda de densidad de par de campo cero (PDW).
  • Para caracterizar la naturaleza de la superconductividad en el pnictide de hierro EuRbFe4As4.
  • Para determinar la relación entre PDW, magnetismo y otras órdenes electrónicas.

Principales métodos:

  • Se empleó el microscopio espectroscópico de exploración de imágenes de túnel (SI-STM).
  • Se realizaron mediciones a granel para corroborar los hallazgos del SI-STM.
  • Las variaciones de temperatura y campo magnético se utilizaron para sondear el estado de PDW.

Principales resultados:

  • Se identificó un estado de PDW de campo cero en EuRbFe4As4.
  • Se observaron modulaciones unidireccionales de largo alcance de la brecha superconductora.
  • El estado PDW coexiste con el magnetismo (Tm ≈ 15 K) y la superconductividad (Tc ≈ 37 K).
  • El estado PDW desaparece por encima de Tm, con la simetría de traslación y rotación recuperada.

Conclusiones:

  • EuRbFe4As4 alberga un estado primario de PDW de campo cero, independiente de otros órdenes de ondas de densidad.
  • El estado PDW en este material exhibe un orden smectic.
  • Este descubrimiento avanza en la comprensión de los estados superconductores no convencionales.