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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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Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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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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Paramagnetism01:30

Paramagnetism

2.8K
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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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

10.7K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Extreme magnetic field-boosted superconductivity.

Sheng Ran1,2,3, I-Lin Liu1,2,3, Yun Suk Eo1

  • 1Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA.

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Researchers discovered multiple high-field superconducting phases in UTe2, exhibiting superconductivity beyond 65 Tesla. This finding challenges existing theories on superconductivity and magnetic fields.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Magnetic fields typically suppress superconductivity.
  • Re-entrant superconductivity, where superconductivity reappears at higher fields, is a rare phenomenon.
  • Spin-triplet superconductors are of particular interest due to their unique properties.

Purpose of the Study:

  • To investigate the behavior of the spin-triplet superconductor UTe2 under extreme magnetic fields.
  • To explore the coexistence of multiple superconducting phases in UTe2.
  • To challenge and refine current theoretical models of superconductivity.

Main Methods:

  • Experimental measurements of UTe2 under high magnetic fields.
  • Analysis of superconducting phase transitions.
  • Comparison with existing theoretical frameworks for superconductivity.

Main Results:

  • Observed multiple re-entrant superconducting phases in UTe2.
  • Demonstrated superconductivity persisting beyond 65 Tesla, a new record for re-entrant superconductors.
  • Identified a coexistence of these phases under extreme magnetic conditions.

Conclusions:

  • The findings challenge current understanding of superconductivity's interaction with magnetic fields.
  • The observed phenomena suggest a novel form of exotic superconductivity.
  • Magnetic fluctuations and quantum dimensional crossover may play crucial roles in UTe2's high-field superconductivity.