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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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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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Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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Pressure induced superconductivity in MnSe.

T L Hung1, C H Huang1, L Z Deng2

  • 1Institute of Physics, Academia Sinica, Taipei, Taiwan.

Nature Communications
|September 15, 2021
PubMed
Summary
This summary is machine-generated.

High pressure suppresses magnetism in manganese selenide (MnSe), inducing superconductivity. This discovery offers new insights into high-temperature superconductivity mechanisms in related materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Iron selenide (FeSe) and related compounds exhibit complex phenomena relevant to high-temperature superconductivity.
  • Investigating manganese selenide (MnSe) is a logical progression to explore superconductivity.

Purpose of the Study:

  • To investigate the potential for superconductivity in manganese selenide (MnSe).
  • To understand the effect of high pressure on the magnetic and superconducting properties of MnSe.

Main Methods:

  • Applying high pressure to manganese selenide (MnSe) samples.
  • Conducting magnetic and resistive measurements to confirm superconductivity.
  • Analyzing pressure-induced structural changes.

Main Results:

  • High pressure suppresses the magnetic properties of MnSe.
  • Superconductivity was induced in MnSe at approximately 12 GPa, with a critical temperature (Tc) of ~5 K.
  • The highest observed Tc reached ~9 K at ~35 GPa.

Conclusions:

  • Pressure-induced superconductivity in MnSe is closely linked to structural changes.
  • The interplay between metallic and insulating interfaces may also contribute to pressure-induced superconductivity in MnSe.