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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Valence Bond Theory02:42

Valence Bond Theory

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...
Ferromagnetism01:31

Ferromagnetism

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Metallic Solids02:37

Metallic Solids

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.
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Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

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Related Experiment Video

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
08:25

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

New non-magnetically ordered heavy-fermion system CeTiGe.

M Deppe1, N Caroca-Canales, S Hartmann

  • 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 10, 2011
PubMed
Summary

CeTiGe exhibits characteristics of a moderate heavy-fermion system, demonstrating Fermi-liquid behavior at low temperatures. This compound shows an enhanced Sommerfeld coefficient without magnetic ordering, indicating a non-magnetic ground state.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Cerium (Ce)-based intermetallic compounds are known for their complex magnetic and electronic properties.
  • Kondo lattice systems exhibit unique phenomena arising from the interaction between localized f-electrons and conduction electrons.

Purpose of the Study:

  • To investigate the low-temperature physical properties of the CeTiGe compound.
  • To classify CeTiGe within the context of heavy-fermion and Kondo lattice systems.
  • To determine the ground state properties and magnetic ordering behavior.

Main Methods:

  • Measurements of magnetic susceptibility, electrical resistivity, specific heat, and thermopower.
  • Low-temperature experimental techniques down to 0.4 K.
  • Analysis of temperature-dependent properties to identify electronic behavior.

Main Results:

  • CeTiGe is identified as a Kondo lattice system with an enhanced Sommerfeld coefficient (γ≈0.3 J K⁻² mol⁻¹).
  • The entire J = 5/2 multiplet participates in the ground state formation.
  • Fermi-liquid behavior was observed below 10 K, evidenced by ρ(T)∼T² electrical resistivity, linear specific heat, and thermopower.
  • No magnetic order was detected down to 0.4 K.

Conclusions:

  • CeTiGe is classified as a moderate heavy-fermion system.
  • The compound possesses a non-magnetic ground state.
  • The findings contribute to the understanding of cerium-based heavy-fermion materials.