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Related Concept Videos

Gap Junctions01:37

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
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Related Experiment Video

Updated: Feb 10, 2026

Fabrication and Characterization of Superconducting Resonators
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Fully gapped d-wave superconductivity in CeCu2Si2.

Guiming Pang1,2, Michael Smidman1,2, Jinglei Zhang1,2

  • 1Center for Correlated Matter, Zhejiang University, Hangzhou 310058, China.

Proceedings of the National Academy of Sciences of the United States of America
|May 10, 2018
PubMed
Summary
This summary is machine-generated.

The heavy fermion superconductor CeCu2Si2 exhibits fully gapped superconductivity, challenging previous d-wave assumptions. New findings support a [Formula: see text] band-mixing pairing state, reconciling conflicting experimental data.

Keywords:
CeCu2Si2heavy fermionsmultiband superconducting pairingpenetration depthsuperconducting order parameter

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Research
  • Materials Science

Background:

  • The pairing symmetry of the heavy fermion superconductor CeCu2Si2 has been debated.
  • Previous studies suggested d-wave superconductivity, while recent specific heat measurements indicated fully gapped behavior.

Purpose of the Study:

  • To investigate the pairing symmetry of CeCu2Si2.
  • To reconcile conflicting experimental results regarding its superconducting state.
  • To propose a new pairing model that explains observed phenomena.

Main Methods:

  • London penetration depth measurements at low temperatures.
  • Analysis of specific heat data.
  • Theoretical modeling of a [Formula: see text] band-mixing pairing state.

Main Results:

  • London penetration depth measurements confirm fully gapped superconductivity in CeCu2Si2.
  • The proposed [Formula: see text] band-mixing pairing state accurately fits superfluid density and specific heat data.
  • This model accounts for a sign change in the superconducting order parameter.

Conclusions:

  • CeCu2Si2 is a fully gapped superconductor, contrary to earlier d-wave interpretations.
  • A novel [Formula: see text] band-mixing pairing state provides a unified explanation for experimental observations.
  • This finding advances the understanding of complex superconducting mechanisms in heavy fermion systems.