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Related Concept Videos

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...
1.1K
Types Of Superconductors01:28

Types Of Superconductors

959
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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Phase Diagram01:19

Phase Diagram

5.8K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
5.8K
Phase Diagrams02:39

Phase Diagrams

40.4K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
40.4K
Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

221
Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
221
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

17.0K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Study on superconductivity in SC and AsC MAX phases at various pressures.

Mohammad Keivanloo1, Mohammad Sandoghchi2, Mohammad Reza Mohammadizadeh1,3

  • 1Department of Physics, University of Tehran, North Kargar Ave, Tehran, 14395-547, Iran.

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|July 30, 2024
PubMed
Summary

Superconducting Scandium Carbonide (ScC) and Arsenide Carbonide (AsC) have transition temperatures that can be tuned with pressure or strain. Applying pressure enhances ScC superconductivity, while strain boosts AsC superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Scandium Carbonide (ScC) and Arsenide Carbonide (AsC) are identified superconducting MAX phases.
  • These materials exhibit superconducting transition temperatures below 10 K and are classified as conventional superconductors.

Purpose of the Study:

  • To investigate the electron-phonon couplings of ScC and AsC.
  • To explore the effects of pressure and strain on the superconducting transition temperatures of ScC and AsC.
  • To determine the potential for enhancing superconductivity in these MAX phases.

Main Methods:

  • Calculation of electron-phonon couplings for ScC and AsC.
  • Analysis of the impact of applied pressure (up to 50 GPa) on superconducting transition temperatures.
  • Investigation of the effects of uniaxial tensile strain along the c-direction on superconducting transition temperatures.

Main Results:

  • Calculated transition temperatures for ScC (~6 K) and AsC (~2 K) closely match experimental data.
  • Applying pressure up to 50 GPa doubles the transition temperature of ScC but decreases that of AsC.
  • A 2% uniaxial tensile strain along the c-direction enhances the transition temperature of AsC by approximately 40%.

Conclusions:

  • The superconducting transition temperatures of ScC and AsC can be significantly modulated by external stimuli.
  • Pressure is beneficial for enhancing superconductivity in ScC, while strain is effective for AsC.
  • These findings highlight the potential for tuning superconductivity in MAX phase compounds through mechanical stress.