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Related Concept Videos

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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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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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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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.
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Magnetic Susceptibility and Permeability

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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.
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Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Related Experiment Video

Updated: Aug 17, 2025

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Multicomponent odd-parity superconductivity in UAu2 at high pressure.

Christopher D O'Neill1, Julian L Schmehr1, Andrew D Huxley1

  • 1School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|December 14, 2022
PubMed
Summary

High-quality uranium diauride (UAu2) single crystals exhibit superconductivity above 3.2 GPa, suppressing an unusual antiferromagnetic state. This new superconducting state shows unique properties, including potential for topological quantum computing applications.

Keywords:
magnetismquantum criticalitysuperconductivitytopological protection

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Heavy fermion materials like uranium diauride (UAu2) exhibit complex electronic behaviors.
  • Antiferromagnetic states in quantum materials can be sensitive to external stimuli like pressure.
  • Understanding pressure-induced phase transitions is crucial for discovering novel quantum phenomena.

Purpose of the Study:

  • To investigate the pressure-dependent phase diagram of uranium diauride (UAu2).
  • To characterize the superconducting state emerging above the suppressed antiferromagnetic phase.
  • To explore the potential of this superconducting state for applications in quantum computing.

Main Methods:

  • High-pressure synthesis and characterization of single-crystal uranium diauride (UAu2).
  • Resistivity measurements under varying pressures and magnetic fields.
  • Analysis of critical magnetic field behavior and angular dependence.

Main Results:

  • Superconductivity emerges in UAu2 above 3.2 GPa, coinciding with the suppression of an unusual antiferromagnetic state.
  • The antiferromagnetic state exhibits marginal Fermi liquid behavior with non-standard resistivity evolution.
  • The pressure-induced superconductivity is robust in high magnetic fields and displays anomalous angular dependence, suggesting a multi-component order parameter.

Conclusions:

  • The observed superconductivity is likely linked to the suppression of the unique antiferromagnetic state.
  • The multi-component order parameter predicts the existence of half-quantum vortices (HQVs).
  • These half-quantum vortices offer potential for topological entanglement and advancements in quantum computing.