Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...

Atomic Nuclei: Magnetic Resonance

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...

Magnetic Field due to Moving Charges

Magnetic Field due to Moving Charges

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...

Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

Magnetic Susceptibility and Permeability

Magnetic Susceptibility and Permeability

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.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

Atomic Nuclei: Nuclear Magnetic Moment

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Relapse risk of lupus-related serositis according to immunosuppressive therapy: a national real-world study.

RMD open·2026

Same author

Safety and efficacy of blinatumomab in the treatment of refractory systemic sclerosis: a case series.

Annals of the rheumatic diseases·2026

Same author

Scaling up X-ray holographic nanotomography for neuronal tissue imaging.

Biomedical optics express·2026

Same author

Correction: Differential effects of physical activity on behavioral and prefrontal responses during repetitive inhibitory control in older adults.

Frontiers in aging neuroscience·2026

Same author

Comparison of disease severity and activity between juvenile- and adult-onset dermatomyositis: a multicentre cohort study.

Rheumatology (Oxford, England)·2026

Same author

Correction: Acute endocrine, immune, and muscle damage responses following a 2,000-m rowing time trial in elite male athletes.

Frontiers in physiology·2026

Search research articles

Related Experiment Video

Updated: Jun 29, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Josephson effect through an isotropic magnetic molecule.

Minchul Lee¹, Thibaut Jonckheere, Thierry Martin

¹Centre de Physique Théorique, UMR6207, Case 907, Luminy, 13288 Marseille Cedex 9, France.

Physical Review Letters

|October 15, 2008

Summary

This summary is machine-generated.

We investigated the Josephson effect in a quantum dot magnet, revealing how exchange coupling influences superconductivity and Kondo correlations. Strong coupling can shift the system between 0 and pi states, with potential for experimental determination of coupling signs.

More Related Videos

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Related Experiment Videos

Last Updated: Jun 29, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Area of Science:

Condensed matter physics
Quantum phenomena
Spintronics

Background:

The Josephson effect describes current flow between superconductors.
Quantum dots offer tunable platforms for studying quantum phenomena.
Kondo correlations arise from magnetic impurities interacting with conduction electrons.

Purpose of the Study:

To investigate the Josephson effect in a quantum dot magnet system.
To analyze the interplay between exchange coupling, Kondo correlations, and superconductivity.
To explore phase transitions between 0 and pi states.

Main Methods:

Calculation of Andreev levels.
Supercurrent calculations.
Theoretical examination of exchange coupling effects.

Main Results:

Exchange coupling suppresses Kondo correlations.
Phase transitions from 0 to pi states are triggered by coupling.
Strong antiferromagnetic coupling restores the 0 state.
An asymmetric phase diagram suggests experimental determination of coupling sign.

Conclusions:

The study elucidates the complex interplay of fundamental quantum phenomena.
Findings provide insights into controlling quantum states in mesoscopic systems.
The proposed asymmetric phase diagram offers a route for experimental verification.