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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.4K
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,...
1.4K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.3K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.3K
Fermi Level01:18

Fermi Level

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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
791
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

44.0K
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,...
44.0K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Two-dimensional antiferromagnetic semiconductor T'-MoTeI from first principles.

Michang Zhang1, Fei Li1, Yulu Ren1

  • 1State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 22, 2022
PubMed
Summary

Monolayer T'-MoTeI is a dynamically stable, intrinsic antiferromagnetic semiconductor with a 1.35 eV bandgap. Its magnetic and electronic properties are robust under strain, making it promising for spintronic applications.

Keywords:
antiferromagnetic semiconductorfirst-principles calculationtwo-dimensional materials

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Chemistry

Background:

  • Two-dimensional (2D) intrinsic antiferromagnetic semiconductors are crucial for advancing spintronics.
  • Exploring novel 2D materials is essential for next-generation electronic devices.

Purpose of the Study:

  • To investigate the intrinsic antiferromagnetic and electronic properties of monolayer T"-MoTeI.
  • To determine the dynamic stability and electronic band structure of T"-MoTeI.
  • To analyze the impact of strain on the material's properties.

Main Methods:

  • First-principles calculations were employed to study the electronic and magnetic properties.
  • Phonon spectrum analysis was used to confirm dynamic stability.
  • Monte Carlo simulations predicted the Néel temperature.

Main Results:

  • Monolayer T"-MoTeI exhibits intrinsic antiferromagnetism and dynamic stability due to Mo atom dimerization.
  • It is an indirect-bandgap semiconductor with a bandgap of 1.35 eV.
  • Strain significantly alters electronic structure but preserves the antiferromagnetic ground state; Néel temperature predicted at 95 K.

Conclusions:

  • Monolayer T"-MoTeI is a stable intrinsic antiferromagnetic semiconductor.
  • Its robust antiferromagnetic state and tunable electronic properties make it a strong candidate for spintronic applications.