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Related Concept Videos

Superconductor01:24

Superconductor

2.0K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Types Of Superconductors01:28

Types Of Superconductors

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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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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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Valence Bond Theory02:42

Valence Bond Theory

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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...
11.5K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.9K
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,...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.6K
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...
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Superconductivity in CaBi2.

M J Winiarski1, B Wiendlocha2, S Gołąb2

  • 1Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland. mwiniarski@mif.pg.gda.pl tomasz.klimczuk@pg.gda.pl.

Physical Chemistry Chemical Physics : PCCP
|July 21, 2016
PubMed
Summary
This summary is machine-generated.

Superconductivity was discovered in CaBi2 single crystals at 2.0 K. This moderate coupling, type-I superconductor exhibits bulk superconductivity, confirmed by various measurements and electronic structure analysis.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Superconductivity is a quantum mechanical phenomenon where a material offers zero electrical resistance below a critical temperature.
  • Understanding new superconducting materials is crucial for advancing technologies like quantum computing and energy transmission.
  • Calcium Bismuthide (CaBi2) is a recently synthesized material with potential for unique electronic properties.

Purpose of the Study:

  • To investigate the superconducting properties of self-flux-grown single crystals of CaBi2.
  • To characterize the material's crystal structure and lattice parameters.
  • To explore the electronic structure and its relationship with superconductivity in CaBi2.

Main Methods:

  • Single crystal growth using a self-flux method.
  • Measurements of magnetic susceptibility, specific heat, and electrical resistivity.
  • First-principles electronic structure calculations, including density of states and Fermi surface analysis.

Main Results:

  • Superconductivity observed in CaBi2 with a critical temperature (Tc) of 2.0 K.
  • CaBi2 crystallizes in the ZrSi2 structure type with determined lattice parameters.
  • Bulk superconductivity confirmed by a heat capacity jump (ΔC/γTc = 1.41).
  • Characterized as a moderate coupling, type-I superconductor with a low thermodynamic critical field (Hc).
  • Electronic structure calculations reveal a mixed quasi-2D + 3D character, influenced by spin-orbit coupling and anisotropy.

Conclusions:

  • CaBi2 is a novel bulk superconductor with moderate electron-phonon coupling.
  • The layered crystal structure significantly influences the electronic properties and superconducting behavior.
  • Further research into CaBi2 could lead to new applications in low-temperature electronics and superconducting devices.