Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Josephson effect in MgB(2) break junctions.

R S Gonnelli1, A Calzolari, D Daghero

  • 1INFM-Dipartimento di Fisica, Politecnico di Torino, 10129 Torino, Italy. gonnelli@polito.it

Physical Review Letters
|September 5, 2001
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

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

Sort by
Same author

Transcriptomics of severe COVID-19.

Vavilovskii zhurnal genetiki i selektsii·2026
Same author

[Risk factors for the development of different variants of primary arteriovenous fistula dysfunction in patients on maintenance hemodialysis].

Angiologiia i sosudistaia khirurgiia = Angiology and vascular surgery·2026
Same author

Population transcriptomics: a novel tool for studying genetic diversity in human populations under normal and pathological conditions.

Vavilovskii zhurnal genetiki i selektsii·2025
Same author

The Forest and Tundra Nenets: differences in Y-chromosome haplogroups.

Vavilovskii zhurnal genetiki i selektsii·2025
Same author

[Placental Tissue Transcriptomics as a Tool to Identify the Molecular Mechanisms of Great Obstetrical Syndromes].

Molekuliarnaia biologiia·2025
Same author

Traces of Paleolithic expansion in the Nivkh gene pool based on data on autosomal SNP and Y chromosome polymorphism.

Vavilovskii zhurnal genetiki i selektsii·2024
Same journal

Erratum: Bacterial Turbulence at Compressible Fluid Interfaces [Phys. Rev. Lett. 136, 138301 (2026)].

Physical review letters·2026
Same journal

Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders.

Physical review letters·2026
Same journal

Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols.

Physical review letters·2026
Same journal

Topological Transition and Emergence of Elasticity of Dislocation in Skyrmion Lattice: Beyond Kittel's Magnetic-Polar Analogy.

Physical review letters·2026
Same journal

Pound-Drever-Hall Method for Superconducting-Qubit Readout.

Physical review letters·2026
Same journal

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026
See all related articles

Researchers observed the Josephson effect in magnesium diboride (MgB2) break junctions, confirming Cooper pairs with a 2e charge. This provides evidence for the superconductor-normal metal-superconductor weak link behavior in MgB2.

Area of Science:

  • Solid State Physics
  • Superconductivity Research
  • Materials Science

Background:

  • Magnesium diboride (MgB2) is a promising superconductor with unique properties.
  • Understanding the nature of charge carriers and weak link behavior in MgB2 is crucial for its technological applications.

Purpose of the Study:

  • To investigate the Josephson effect in MgB2 break junctions.
  • To confirm the charge of Cooper pairs in MgB2.
  • To characterize the weak link behavior in these junctions.

Main Methods:

  • Fabrication of MgB2 break junctions at 4.2 K using high-quality polycrystalline samples.
  • Observation of the direct current (dc) and alternating current (ac) Josephson effects.
  • Irradiation of junctions with microwaves to observe Shapiro steps.

Related Experiment Videos

  • Measurement of temperature dependence of dc Josephson current and microwave power dependence of Shapiro step height.

    • Main Results:

    • First observation of both dc and ac Josephson effects in MgB2 break junctions.
    • Nonhysteretic dc Josephson effect observed.
    • Clear Shapiro steps, spaced by the ideal Delta V, were observed upon microwave irradiation.
    • Temperature dependence of critical current and microwave power dependence of step height were systematically studied.

    Conclusions:

    • The results provide direct proof for the existence of Cooper pairs with a charge of 2e in MgB2.
    • The observed behavior confirms the superconductor-normal metal-superconductor weak link character of the MgB2 break junctions.
    • This study enhances the understanding of superconductivity mechanisms in MgB2.