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Related Concept Videos

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
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...
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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
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.3K
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,...
1.3K
Electrical Conductivity01:13

Electrical Conductivity

1.1K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.3K

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Updated: Jun 6, 2025

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

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Nonreciprocal superconductivity.

Margarita Davydova1, Max Geier1, 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.

We introduce nonreciprocal superconductors, materials with broken symmetries. Their unique asymmetric energy dispersion can be detected via Andreev reflection, offering a new method for identifying these exotic states.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Research
  • Materials Science

Background:

  • Superconductors typically exhibit symmetric energy dispersion.
  • Broken inversion and time-reversal symmetries are key to novel superconducting phenomena.
  • Detecting exotic superconducting states requires specific experimental signatures.

Purpose of the Study:

  • To introduce and define nonreciprocal superconductors.
  • To propose a detection method for nonreciprocal superconductivity using Andreev reflection.
  • To identify potential material candidates exhibiting nonreciprocal superconductivity.

Main Methods:

  • Theoretical introduction of nonreciprocal superconductors with broken symmetries.
  • Analysis of Andreev reflection at a normal metal-nonreciprocal superconductor junction.
  • Investigation of current-voltage characteristics for asymmetry.

Main Results:

  • Nonreciprocal superconductors possess asymmetric energy dispersion.
  • Andreev reflection at a transparent junction reveals asymmetric current-voltage characteristics.
  • This asymmetry serves as a defining feature for detecting nonreciprocal superconductivity.

Conclusions:

  • A novel detection scheme for nonreciprocal superconductivity via Andreev reflection is established.
  • The proposed method avoids issues associated with large critical currents seen in other effects.
  • Potential candidates like graphene, UTe2, and engineered systems are discussed.