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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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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

4.6K
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.
4.6K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

8.8K
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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

1.5K
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Multiple-qcurrent states in a multicomponent superconducting channel.

Yuriy Yerin1,2, Stefan-Ludwig Drechsler3, Mario Cuoco4

  • 1Dipartimento di Fisica e Geologia, Universitá degli Studi di Perugia, Via Pascoli, 06123 Perugia, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 25, 2023
PubMed
Summary

Researchers discovered a new "multiple-q state" in two-component superconductors. This novel inhomogeneous current state involves coexisting Cooper pair condensates, leading to complex transitions and bistable current states in superconducting wires.

Keywords:
Ginzburg–Landau theorychiral superconductivitydepairing currentmulticomponent superconductivity

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • Multicomponent superconductors exhibit diverse nonstandard phenomena, including broken-time reversal symmetry (BTRS) states, exotic Fulde-Ferrell-Larkin-Ovchinnikov phases, and topological defects.
  • These phenomena arise from the complex interactions within multiple superconducting condensates.

Purpose of the Study:

  • To identify and characterize novel inhomogeneous current states in two-component superconducting quasi-one-dimensional channels.
  • To investigate the interplay between homogeneous and inhomogeneous current states under specific conditions.

Main Methods:

  • Utilized the Ginzburg-Landau formalism to model a dirty two-band superconductor.
  • Incorporated sizable impurity scattering treated within the Born approximation.
  • Analyzed the behavior of Cooper pair condensates and their momenta.

Main Results:

  • Introduced a novel 'multiple-q state' characterized by two interpenetrating Cooper pair condensates with different total momenta.
  • Demonstrated that multiple-q states can induce transitions between homogeneous (BTRS and non-BTRS) and inhomogeneous states.
  • Identified a saw-like dependence of the depairing current and bistable current states as hallmarks of the multiple-q state in thin wires.

Conclusions:

  • The study extends the known phenomena in multicomponent superconductors by introducing the multiple-q state.
  • This state reveals a complex interplay between homogeneous and inhomogeneous current states.
  • The findings suggest potential for novel superconducting device functionalities based on bistable current states.