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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.2K
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

Superconductor

1.3K
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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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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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.5K
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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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...
9.7K
Ferromagnetism01:31

Ferromagnetism

2.5K
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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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Nonunitary superconductivity in complex quantum materials.

Aline Ramires1

  • 1Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 5, 2022
PubMed
Summary
This summary is machine-generated.

Nonunitary superconductivity, where superconducting states lack time-reversal symmetry, is explored in complex quantum materials. This phenomenon, common in d-electron systems, offers new insights into exotic superconducting behaviors.

Keywords:
complex quantum materialsnonunitary superconductivityunconventional superconductivity

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Nonunitary superconductivity is a state where time-reversal symmetry is broken.
  • Understanding its manifestations in complex quantum materials is crucial.

Purpose of the Study:

  • To generalize the concept of nonunitary superconductivity to complex quantum materials.
  • To identify spectral signatures and potential material candidates.

Main Methods:

  • Review of nonunitary superconductivity in simple models.
  • Analysis of d-electron systems with two orbitals.
  • Investigation of superconducting spectra and order parameters.

Main Results:

  • Complex materials offer more possibilities for nonunitary order parameters.
  • Gap openings at band crossings indicate nonunitary order parameters.
  • A finite superconducting fitness matrix is a key indicator.

Conclusions:

  • Nonunitary superconductivity is likely prevalent in complex quantum materials.
  • It may explain recently observed time-reversal symmetry breaking superconductors.