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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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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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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
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Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

14.1K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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For example, in...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Strain-stabilized superconductivity.

J P Ruf1, H Paik2,3, N J Schreiber3

  • 1Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, 14853, USA. jpr239@cornell.edu.

Nature Communications
|January 5, 2021
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Summary
This summary is machine-generated.

Researchers transformed a normal metal into a superconductor by applying epitaxial strain. This method enhances the density of states near the Fermi level, stabilizing superconductivity and offering a new strategy for designing superconductors.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum materials

Background:

  • Superconductivity, a quantum state of matter, has been studied for over 100 years.
  • Understanding the link between normal-state electronic structure and superconducting properties remains a challenge.
  • Deterministic enhancement of superconducting transition temperature is a long-sought goal.

Purpose of the Study:

  • To investigate the transmutation of a normal metal into a superconductor.
  • To explore the role of epitaxial strain in stabilizing superconductivity.
  • To develop a new strategy for designing transition-metal superconductors.

Main Methods:

  • Synthesizing Ruthenium Dioxide (RuO2) thin films on Titanium Dioxide (TiO2) substrates.
  • Applying epitaxial strain to the thin films.
  • Analyzing the electronic structure and superconducting properties.

Main Results:

  • Epitaxial strain was successfully applied to synthesize RuO2 thin films.
  • The applied strain enhanced the density of states near the Fermi level.
  • Superconductivity was stabilized in the strained RuO2 films.

Conclusions:

  • Anisotropic epitaxial strain can induce superconductivity in normal metals.
  • Modulating the electronic structure, specifically the density of states, is key to stabilizing superconductivity.
  • This approach offers a promising strategy for the rational design of new transition-metal superconductors.