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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.1K
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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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field Lines01:19

Magnetic Field Lines

4.4K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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High-field superconducting halo in UTe2.

Sylvia K Lewin1,2, Peter Czajka1,2, Corey E Frank1,2

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Science (New York, N.Y.)
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The heavy fermion superconductor UTe2 displays a unique high-field superconducting phase. This phase, stabilized by a specific magnetic field orientation, suggests a complex spin-triplet pairing mechanism in this exotic material.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • UTe2 is a heavy fermion material and a prime candidate for topological superconductivity.
  • It exhibits multiple superconducting phases that are induced by magnetic fields.
  • One unusual phase emerges only at very high magnetic fields (> 40 tesla) near its low critical temperature (2 K).

Purpose of the Study:

  • To investigate the structure and field dependence of the high-field superconducting phase in UTe2.
  • To explore the role of magnetic field orientation in stabilizing this exotic superconducting state.
  • To gain insights into the underlying pairing mechanism and order parameter symmetry.

Main Methods:

  • Performed magnetic susceptibility measurements on UTe2 single crystals.
  • Applied ultra-high magnetic fields exceeding 40 tesla.
  • Systematically varied the magnetic field orientation relative to the crystallographic axes, particularly away from the bc plane.

Main Results:

  • The high-field superconducting phase exhibits a distinct halo-like structure around the b crystallographic axis.
  • This phase is stabilized by a magnetic field component oriented perpendicular to the material's magnetic easy axis.
  • The observed angular dependence strongly suggests a multicomponent spin-triplet order parameter with finite angular momentum Cooper pairs.

Conclusions:

  • The findings reveal the intricate structure of a novel high-field superconducting phase in UTe2.
  • The results point towards a complex, likely unconventional, pairing mechanism that challenges existing theories of field-enhanced superconductivity.
  • UTe2's unique magnetophilic superconducting properties warrant further theoretical and experimental investigation.