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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

937
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...
937
Superconductor01:24

Superconductor

1.1K
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...
1.1K
Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Paramagnetism01:30

Paramagnetism

2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

979
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
979

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Magnonic superconductivity.

Khachatur G Nazaryan1, Liang Fu1

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science Advances
|November 29, 2024
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Summary
This summary is machine-generated.

Researchers discovered a new "magnonic superconductor" state, driven by magnetic fields. This novel superconducting state features unique composite order parameters and exhibits high transition temperatures in models.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity Research

Background:

  • Conventional superconductivity relies on electron pairing via specific mechanisms.
  • The role of magnetic fields and spin polarization in exotic superconducting states remains an active area of research.
  • Understanding novel order parameters is crucial for advancing superconductivity theory.

Purpose of the Study:

  • To identify and characterize a novel superconducting state induced by a magnetic field.
  • To investigate the nature of the order parameter in this new state, termed 'magnonic superconductor'.
  • To explore the potential for high-temperature superconductivity and novel phenomena like higher-charge superconductivity.

Main Methods:

  • Theoretical investigation of one-dimensional and two-dimensional Hubbard models.
  • Analysis of systems with repulsive interactions under magnetic field influence.
  • Demonstration of a composite order parameter involving electron pairs and magnons.

Main Results:

  • Discovery of a superconducting state with partial spin polarization induced by a magnetic field.
  • Identification of a composite order parameter, distinct from conventional pairing mechanisms.
  • Rigorous demonstration of high transition temperature magnonic superconductivity in Hubbard models.
  • Evidence for magnonic Cooper pairs forming higher-charge bound states, enabling charge-6e superconductivity.

Conclusions:

  • A novel 'magnonic superconductor' state has been theoretically established.
  • This state is characterized by a unique composite order parameter and magnetic field induction.
  • The findings suggest new pathways for achieving high-temperature superconductivity and exotic charge states.