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Related Concept Videos

Paramagnetism01:30

Paramagnetism

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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...
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Types Of Superconductors01:28

Types Of Superconductors

1.8K
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...
1.8K
Superconductor01:24

Superconductor

2.1K
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...
2.1K
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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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.8K
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...
2.8K
Diamagnetism01:26

Diamagnetism

3.4K
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....
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Giant paramagnetic Meissner effect in multiband superconductors.

R M da Silva1, M V Milošević2, A A Shanenko3

  • 1Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal de Pernambuco, Av. Jorn. Aníbal Fernandes, s/n, 50670-901 Recife-PE, Brazil.

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Summary
This summary is machine-generated.

Giant paramagnetic responses were observed in multiband superconductors, challenging previous understanding of magnetic flux behavior. This phenomenon, linked to vortex interactions, offers new insights into superconductor properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Superconductors typically exhibit diamagnetism in the Meissner state.
  • Paramagnetic behavior can occur due to trapped magnetic flux, but is usually weak and diminishes with sample thickness.

Purpose of the Study:

  • To investigate the conditions under which significant paramagnetic responses can be observed in superconductors.
  • To explore the nature of magnetic flux behavior in multiband superconductors, particularly in slab geometries.

Main Methods:

  • Theoretical analysis of magnetic flux interactions in multiband superconductors.
  • Modeling of vortex behavior and flux configurations in slab geometries.

Main Results:

  • Demonstrated that multiband superconductors can exhibit giant paramagnetic responses, even in slab geometries.
  • Quantified this response to be significantly larger than previously estimated, exceeding diamagnetic Meissner response.

Conclusions:

  • The giant paramagnetic response is linked to the crossover between Type-I and Type-II superconductivity.
  • Non-monotonic vortex interactions and multibody effects lead to unique flux configurations and surface locking.