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Related Concept Videos

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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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 hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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CORRIGENDUM: The missing angular momentum of superconductors (2008<i>J. Phys.: Condens. Matter</i> 20 235233).

Journal of physics. Condensed matter : an Institute of Physics journal·2026
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The Meissner effect in superconductors: emergence versus reductionism.

Journal of physics. Condensed matter : an Institute of Physics journal·2026
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On Thermal and Electrodynamic Aspects of the Superconductive Transition Process.

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Comment on "Carbon content drives high temperature superconductivity in a carbonaceous sulfur hydride below 100 GPa" by G. A. Smith, I. E. Collings, E. Snider, D. Smith, S. Petitgirard, J. S. Smith, M. White, E. Jones, P. Ellison, K. V. Lawler, R. P. Dias and A. Salamat, <i>Chem. Commun.</i>, 2022, <b>58</b>, 9064.

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Related Experiment Video

Updated: Jun 23, 2025

High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
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Are hydrides under high-pressure-high-temperature superconductors?

J E Hirsch1

  • 1Department of Physics, University of California, San Diego, USA.

National Science Review
|June 17, 2024
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Evidence for high-temperature superconductivity in hydrides under high pressure is not compelling. Further research should focus on confirming the existence of superconductivity in these materials, rather than seeking new ones.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • High-pressure hydrides are candidates for high-temperature superconductivity.
  • Current evidence supporting superconductivity in these materials is debated.

Purpose of the Study:

  • To critically evaluate the evidence for high-temperature superconductivity in hydrides.
  • To propose a new research direction for the field.

Main Methods:

  • Review and analysis of existing experimental data.
  • Theoretical considerations of superconductivity mechanisms.

Main Results:

  • The current evidence for high-temperature superconductivity in pressurized hydrides is not compelling.
  • Existing signals of superconductivity are elusive and require further verification.

Conclusions:

  • The field should prioritize experimental confirmation of superconductivity in hydrides.
  • A shift in focus is needed from discovering new materials to verifying existing claims.
  • The implications of a negative finding for superconductivity theory are significant.