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Related Concept Videos

Superconductor01:24

Superconductor

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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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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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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.
An electron moves through the crystal, containing positive ions,...
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Ferromagnetism01:31

Ferromagnetism

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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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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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Metallic Solids02:37

Metallic Solids

19.4K
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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Updated: Oct 3, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Superconductivity in Heusler compound ScAu2Al.

Biplab Bag1, Rajendra Loke1, Birender Singh1

  • 1Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 17, 2022
PubMed
Summary

ScAu2Al exhibits superconductivity at 5.12 K, the highest among Heusler superconductors. Moderate electron-phonon coupling (λe-ph=0.77) plays a key role, with electronic structure revealing a van Hove singularity.

Keywords:
Heusler superconductorselectronic structureelectron–phonon couplingflux jumpsuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Heusler compounds are a promising class of materials for superconductivity.
  • Understanding the factors influencing superconducting transition temperature (Tc) is crucial for discovering new superconductors.

Purpose of the Study:

  • To investigate the superconducting properties and electronic structure of the full Heusler material ScAu2Al.
  • To determine the electron-phonon coupling strength and its correlation with superconductivity in ScAu2Al.

Main Methods:

  • Resistivity measurements to determine the superconducting transition temperature (Tc).
  • Magnetization measurements to characterize the superconducting state (e.g., type-II superconductivity, critical fields).
  • Specific heat measurements to confirm bulk superconductivity.
  • Electronic structure calculations to identify key features like van Hove singularities.

Main Results:

  • ScAu2Al exhibits superconductivity with a Tc of 5.12 K, higher than previously reported.
  • The material behaves as a moderate type-II superconductor with evidence of flux jumps.
  • A sharp jump in specific heat confirms bulk superconductivity.
  • The electron-phonon coupling constant (λe-ph) is determined to be 0.77, the highest among Heusler superconductors.
  • Electronic structure calculations reveal a van Hove singularity near the Fermi level.

Conclusions:

  • ScAu2Al is a significant Heusler superconductor with a high Tc.
  • Electron-phonon coupling is strongly correlated with Tc in Heusler superconductors.
  • The identified van Hove singularity may contribute to the observed superconducting properties.