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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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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....
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Crystal Field Theory - Octahedral Complexes02:58

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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.
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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.
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Ferromagnetism01:31

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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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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.
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Interaction-Induced Metallicity in a Two-Dimensional Disordered Non-Fermi Liquid.

P A Nosov1, I S Burmistrov2,3, S Raghu1,4

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Disordered electron systems near a quantum critical point exhibit perfect conduction. Unlike previous models, this study shows a stable system without runaway interactions, offering new insights into two-dimensional (2D) electron behavior.

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Area of Science:

  • Condensed matter physics
  • Quantum criticality
  • Disordered systems

Background:

  • Two-dimensional (2D) electron systems are crucial for understanding condensed matter phenomena.
  • The interplay between electron interactions and disorder is a long-standing research area.
  • Traditional studies often begin with Fermi liquids, but this work explores a non-Fermi liquid starting point.

Purpose of the Study:

  • To investigate the effects of disorder on a clean non-Fermi liquid near a 2D ferromagnetic quantum critical point.
  • To determine if a stable, conducting state can emerge under these conditions.
  • To contrast the findings with the behavior of disordered Fermi liquids.

Main Methods:

  • Theoretical modeling of a 2D electron system.
  • Analysis of a non-Fermi liquid state near a quantum critical point.
  • Inclusion of disorder effects within the model.

Main Results:

  • The proposed model avoids runaway flows to strong coupling, a common issue in disordered systems.
  • A marginally stable fixed point is identified.
  • The system demonstrates perfect conduction.

Conclusions:

  • Disorder can lead to stable, perfectly conducting states in non-Fermi liquids near quantum critical points.
  • This approach offers an alternative to studying disordered Fermi liquids.
  • The findings provide a new perspective on electron behavior in 2D systems.