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Superconductor01:24

Superconductor

1.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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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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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Inductance: Solid Cylindrical Conductor01:24

Inductance: Solid Cylindrical Conductor

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To calculate the inductance of a solid cylindrical conductor, consider a 1-meter section of a non-magnetic, current-carrying conductor with radius r. Disregarding end effects and assuming uniform current density, Ampere's law helps determine the magnetic field inside the conductor. This law states that the magnetic field intensity H is concentric and constant within the conductor.
Given the uniform current distribution, the magnetic field Hx and flux density Bx inside the conductor are...
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Metallic Solids02:37

Metallic Solids

18.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Superconductivity in Ca-intercalated bilayer graphene: C2CaC2.

Jin-Han Tan1, Hao Wang1, Ying-Jie Chen1

  • 1School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China. qfzhmm@163.com.

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|April 2, 2024
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Researchers discovered a new calcium-intercalated bilayer graphene, C2CaC2, exhibiting superconductivity at 18.9 K. Applying strain further increased the critical temperature to 26.6 K, offering a new platform for high-temperature graphene superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Superconductivity in graphene is induced by metal atom deposition or intercalation.
  • Existing metal-intercalated graphenes show relatively low critical temperatures (Tc).
  • Higher Tc superconductors are sought for advanced technological applications.

Purpose of the Study:

  • To predict and investigate a new Ca-intercalated bilayer graphene (C2CaC2) with potentially higher superconductivity.
  • To explore the electronic structure, electron-phonon coupling (EPC), and superconducting properties of C2CaC2.
  • To assess the impact of strain on the superconducting properties of C2CaC2.

Main Methods:

  • First-principles calculations were employed to study C2CaC2.
  • Thermodynamic and dynamic stability of C2CaC2 were assessed.
  • Electronic structure, EPC, and superconducting properties were calculated.

Main Results:

  • C2CaC2 was predicted to be thermodynamically and dynamically stable.
  • The electron-phonon coupling in C2CaC2 primarily involves C-p orbitals and C atom vibrations.
  • A superconducting critical temperature (Tc) of 18.9 K was calculated for C2CaC2.
  • Applying -4% biaxial compressive strain boosted the Tc to 26.6 K.

Conclusions:

  • C2CaC2 exhibits significantly higher superconductivity than previously reported metal-intercalated bilayer graphenes.
  • The high Tc in C2CaC2 is attributed to strong electron-phonon coupling.
  • C2CaC2 represents a promising new material for achieving high-Tc superconductivity in bilayer graphene systems.