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Videos de Conceptos Relacionados

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Grandes respuestas magnéticas acopladas en EuNbO2NN.

A Belén Jorge1, Judith Oró-Solé, Ana M Bea

  • 1Institut de Ciència de Materials de Barcelona (C.S.I.C.), Campus U.A.B., 08193 Bellaterra, Spain.

Journal of the American Chemical Society
|September 2, 2008
PubMed
Resumen

Los investigadores sintetizaron nuevas perovskitas, EuMO2N, para encontrar materiales que responden fuertemente a los campos magnéticos. EuNbO2N exhibe una magnetorresistencia colosal y una magnetocapacitancia gigante, aunque esta última está impulsada por microestructuras.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Química del estado sólido.

Sus antecedentes:

  • El descubrimiento de materiales con respuestas significativas a los campos magnéticos es crucial para las aplicaciones electrónicas avanzadas.
  • Las estructuras de perovskita ofrecen una plataforma versátil para ajustar las propiedades electrónicas y magnéticas.
  • La interacción entre el orden magnético y las distorsiones estructurales puede conducir a fenómenos magnetoeléctricos únicos.

Objetivo del estudio:

  • Explorar una nueva estrategia para descubrir materiales con grandes respuestas resistivas o capacitivas a los campos magnéticos.
  • Para sintetizar y caracterizar los nuevos perovskitas de europio-molibdeno-oxinitruro (EuMO2N).
  • Para investigar las propiedades magnéticas y magnetoeléctricas de estos nuevos materiales.

Principales métodos:

  • Síntesis de las perovskitas EuMO2N (M = Nb, Ta).
  • Caracterización del orden ferromagnético de los espines Eu2+.
  • Investigación de las posibles distorsiones fuera de centro de los cationes M5+.
  • Medición de la resistencia eléctrica y la capacidad bajo campos magnéticos variables a bajas temperaturas.

Principales resultados:

  • Las perovskitas EuNbO2N fueron sintetizadas con éxito, exhibiendo un orden ferromagnético.
  • EuNbO2N mostró colosales magnetorresistencias a bajas temperaturas.
  • Se observó un efecto de magnetocapacidad gigante en EuNbO2N.
  • La magnetocapacidad fue atribuida a un efecto microestructural, no al multiferroísmo intrínseco.

Conclusiones:

  • Las perovskitas EuMO2N representan una clase prometedora de materiales para explorar las respuestas de los campos magnéticos.
  • EuNbO2N demuestra una magnetorresistencia colosal significativa, lo que pone de relieve su potencial para la detección magnética.
  • La magnetocapacitancia gigante observada en EuNbO2N está vinculada a la microestructura, lo que requiere una mayor investigación de los efectos intrínsecos.