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Related Concept Videos

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.2K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.0K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.0K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.2K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.2K
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

4.9K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
4.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.2K
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...
26.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.5K
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,...
41.5K

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Related Experiment Video

Updated: Jun 6, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Large Band Splitting in g-Wave Altermagnet CrSb.

Jianyang Ding1,2,3, Zhicheng Jiang4, Xiuhua Chen5

  • 1<a href="https://ror.org/03rx2tr07">National Synchrotron Radiation Laboratory</a>, <a href="https://ror.org/04c4dkn09">University of Science and Technology of China</a>, Hefei 230026, China.

Physical Review Letters
|December 3, 2024
PubMed
Summary
This summary is machine-generated.

CrSb exhibits altermagnetism (AM) with giant spin splitting and a high Néel temperature. This research validates CrSb as a prototype g-wave-like AM material for spintronics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism (AM) combines ferromagnetism and antiferromagnetism properties.
  • Existing AM materials like MnTe lack sufficient spin splitting and high transition temperatures.
  • Discovering new AM materials with enhanced properties is crucial for technological advancement.

Purpose of the Study:

  • To investigate CrSb as a potential altermagnetic material.
  • To characterize the electronic structure and spin splitting in CrSb.
  • To explore the potential of CrSb for spintronic applications.

Main Methods:

  • High-resolution angle-resolved photoemission spectroscopy (ARPES).
  • Density functional theory (DFT) calculations.
  • Analysis of electronic band structure and spin splitting.

Main Results:

  • CrSb exhibits a high Néel temperature of 700 K.
  • Giant spin splitting of 0.93 eV near the Fermi level was observed.
  • The unique bulk g-wave symmetry of AM-induced band splitting was identified.

Conclusions:

  • CrSb is validated as a prototype g-wave-like altermagnetic material.
  • The substantial spin splitting in CrSb makes it promising for spintronics.
  • This study paves the way for developing advanced spintronic devices.