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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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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Pressure-induced superconductivity in CaC2.

Yan-Ling Li1, Wei Luo, Zhi Zeng

  • 1School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|May 22, 2013
PubMed
Summary
This summary is machine-generated.

Under compression, calcium carbide transforms into various carbon structures, including a 2D graphite sheet. This high-pressure phase exhibits strong electron-phonon coupling, leading to a high superconducting critical temperature.

Keywords:
high pressuremetallization

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Carbon exhibits diverse bonding (sp, sp2, sp3) and structural forms (1D, 2D, 3D).
  • sp2-hybridized carbon structures possess unique physical and chemical properties.
  • Understanding pressure-induced structural transformations in carbon materials is crucial.

Purpose of the Study:

  • To investigate the pressure-induced polymerization of carbon dumbbells in calcium carbide (CaC2).
  • To explore the structural and electronic properties of compressed CaC2.
  • To determine the superconducting properties of high-pressure phases of CaC2.

Main Methods:

  • Utilized an evolutionary algorithm combined with ab initio calculations.
  • Simulated structural transformations of CaC2 under varying pressures.
  • Calculated electron-phonon coupling and superconducting critical temperature.

Main Results:

  • Observed polymerization of carbon dumbbells into 1D chains, ribbons, and 2D graphite sheets under compression.
  • Identified stable phases including Cmcm, Immm, and MgB2-type structures up to 1 TPa.
  • Discovered strong electron-phonon coupling (λ ≈ 0.56) in the Immm phase, yielding a superconducting critical temperature (Tc) of 7.9–9.8 K.

Conclusions:

  • Calcium stabilizes sp2 carbon hybridization over a wide pressure range in CaC2.
  • Compressed CaC2 exhibits significant superconducting behavior, comparable to CaC6.
  • These findings stimulate further research into alkaline-earth metal carbides under extreme conditions.