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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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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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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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Updated: Apr 12, 2026

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Unconventional superconductivity in UAs2 under pressure.

Qing Li1, Zhe-Ning Xiang1, Bin-Bin Zhang2

  • 1National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Science Advances
|April 10, 2026
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Summary
This summary is machine-generated.

Researchers discovered superconductivity in uranium arsenide (UAs2) under high pressure, reaching up to 4 K. This finding in a novel uranium-based system offers new insights into unconventional superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Uranium ditelluride (UTe2) is a notable spin-triplet superconductor candidate.
  • Uranium arsenide (UAs2) exhibits metallic behavior and an antiferromagnetic transition near 274 K at ambient pressure.

Purpose of the Study:

  • To investigate the pressure-induced effects on UAs2, particularly the emergence of superconductivity.
  • To explore the relationship between antiferromagnetism, pressure, and superconductivity in UAs2.

Main Methods:

  • High-pressure experiments were conducted on UAs2 samples.
  • Electrical resistance measurements were performed as a function of temperature and pressure.
  • Magnetic field response of the superconducting state was analyzed.

Main Results:

  • Superconductivity was observed in UAs2 at temperatures up to approximately 4 K under pressures exceeding 20 GPa.
  • An antiferromagnetic transition was suppressed by pressure, correlating with improved conductivity.
  • The superconductivity exhibited robustness against magnetic fields, with an upper critical field exceeding the Pauli limit.
  • Fermi liquid behavior reappeared at even higher pressures, suppressing superconductivity.

Conclusions:

  • High pressure drives UAs2 into a superconducting state, linked to the suppression of its antiferromagnetic order.
  • The observed unconventional superconductivity in UAs2 highlights the potential of uranium-based systems for exploring novel quantum phenomena.
  • This discovery opens new avenues for studying the role of 5f-band electrons in unconventional superconductivity.