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Related Concept Videos

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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Superconductor01:24

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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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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
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Colors and Magnetism03:02

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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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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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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...
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Multiband superconductivity in BiS2-based layered compounds.

M A Griffith1, T O Puel1, M A Continentino1

  • 1Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, Urca, 22290-180 Rio de Janeiro, RJ, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 3, 2017
PubMed
Summary
This summary is machine-generated.

This study explores a two-orbital model for superconductivity, revealing a complex phase diagram. An orbital-mixing ratio helps analyze how different superconducting states emerge with electron doping.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Theory

Background:

  • Superconductivity in multi-orbital systems is complex.
  • Understanding the interplay of different superconducting states is crucial.

Purpose of the Study:

  • To investigate a two-orbital model for superconductivity.
  • To analyze the phase diagram considering intra- and inter-orbital superconductivity.

Main Methods:

  • A mean-field treatment of a square lattice two-orbital model.
  • Analysis of the phase diagram as a function of coupling ratios and electron doping.
  • Introduction of an orbital-mixing ratio to interpret the phase diagram.

Main Results:

  • A rich phase diagram emerges, featuring both intra- and inter-orbital superconductivity.
  • The orbital-mixing ratio provides an intuitive picture of phase transitions.
  • The orbital-mixing ratio correlates with electron doping levels.

Conclusions:

  • The orbital-mixing ratio is a valuable tool for analyzing multiband superconductivity.
  • This approach offers qualitative and semi-quantitative insights into BCS-like superconductors.
  • The study advances the understanding of complex superconducting phenomena.