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Related Concept Videos

Superconductor01:24

Superconductor

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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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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 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.
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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High-temperature superconductivity in compressed solid silane.

Huadi Zhang1, Xilian Jin1, Yunzhou Lv1

  • 1State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.

Scientific Reports
|March 10, 2015
PubMed
Summary
This summary is machine-generated.

High-pressure studies reveal two metallic silane structures, P2₁/c and C2/m, stable above 383 GPa. The C2/m phase exhibits a high superconducting critical temperature exceeding 100 K.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational chemistry

Background:

  • Silane (SiH4) exhibits complex structural and electronic properties under extreme conditions.
  • Understanding high-pressure phases is crucial for discovering novel materials with unique properties.

Purpose of the Study:

  • To investigate the crystal structures of silane at high pressures.
  • To explore the superconducting properties of predicted metallic silane phases.
  • To determine the critical temperature of superconductivity in these phases.

Main Methods:

  • Ab initio evolutionary simulation methods were employed to predict stable crystal structures.
  • Density Functional Theory (DFT) calculations were used for structural and electronic property analysis.
  • Bardeen-Coper-Hess-Schrieffer (BCS) theory and linear-response calculations were applied to study superconductivity.

Main Results:

  • Two metallic silane structures with P2₁/c and C2/m symmetries were identified as stable above 383 GPa.
  • Superconducting properties of these metallic phases were systematically investigated.
  • The C2/m silane phase at 610 GPa demonstrated a high superconducting critical temperature (Tc) exceeding 100 K.

Conclusions:

  • High pressure stabilizes metallic phases of silane with potential for high-temperature superconductivity.
  • The C2/m silane structure represents a promising candidate for further experimental and theoretical investigation.
  • This study contributes to the understanding of silane's behavior under extreme conditions and the search for novel superconductors.