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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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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.
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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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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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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Related Experiment Video

Updated: Dec 23, 2025

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
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An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

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Superconductivity in Compression-Shear Deformed Diamond.

Chang Liu1, Xianqi Song1, Quan Li1,2

  • 1State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, Department of Materials Science, and Innovation Center for Computational Physics Method and Software, Jilin University, Changchun 130012, China.

Physical Review Letters
|April 28, 2020
PubMed
Summary
This summary is machine-generated.

Superconductivity was achieved in undoped diamond through compression-shear deformation. This strain engineering approach induces metallization and lattice softening, leading to a critical temperature up to 12.4 K.

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Last Updated: Dec 23, 2025

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Physics

Background:

  • Diamond, an ultrawide band gap semiconductor, exhibits superconductivity near 4 K with significant boron doping.
  • Previous research established a link between boron concentration and superconductivity in diamond.

Purpose of the Study:

  • To explore a novel method for inducing superconductivity in undoped diamond.
  • To investigate the effects of strain engineering on diamond's electronic properties and superconducting behavior.

Main Methods:

  • Applying compression-shear deformation to undoped diamond samples.
  • Analyzing the resulting metallization and lattice softening under increasing strain.
  • Measuring the critical temperature (Tc) of superconductivity.

Main Results:

  • Superconductivity was achieved in undoped diamond via strain engineering.
  • Compression-shear deformation led to metallization and lattice softening.
  • Phonon-mediated superconductivity with critical temperatures ranging from 2.4 to 12.4 K was observed.

Conclusions:

  • Strain engineering offers a new pathway to superconductivity in diamond, independent of doping.
  • This method demonstrates the potential for inducing superconductivity in normally nonsuperconductive materials.
  • The findings provide insights for experimental exploration of strain-engineered superconductors.