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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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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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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.
An electron moves through the crystal, containing positive ions,...
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Types of Semiconductors01:20

Types of Semiconductors

1.3K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Phase Diagram01:19

Phase Diagram

6.9K
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).
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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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Superconductivity under pressure in the Dirac semimetal PdTe2.

H Leng1, A Ohmura2,3, L N Anh4

  • 1Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 2, 2019
PubMed
Summary
This summary is machine-generated.

High pressure enhances superconductivity in palladium ditelluride (PdTe2), peaking at 1.91 K. Surface superconductivity surprisingly exceeds bulk, suggesting a topological nature for this Dirac semimetal.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Palladium ditelluride (PdTe2) is a Dirac semimetal exhibiting type-I superconductivity.
  • Unusual surface superconductivity has been observed in PdTe2.

Purpose of the Study:

  • Investigate the superconducting phase diagram of PdTe2 under high pressure.
  • Explore the pressure dependence of bulk and surface superconductivity.
  • Determine the nature of surface superconductivity in PdTe2.

Main Methods:

  • High-pressure studies up to 2.5 GPa.
  • AC susceptibility and transport measurements on single crystalline samples.
  • Analysis of superconducting phase diagram and transition temperatures.

Main Results:

  • Superconducting transition temperature (Tc) shows non-monotonic pressure dependence, peaking at 1.91 K around 0.91 GPa.
  • Surface superconductivity remains robust under pressure.
  • Surface Tc exceeds bulk Tc at higher pressures (above 1.5 GPa), indicating a potentially non-trivial topological nature.

Conclusions:

  • High pressure significantly influences the superconducting properties of PdTe2.
  • The observed surface superconductivity may possess non-trivial topological characteristics.
  • Band structure calculations and Van Hove singularities are crucial for understanding the pressure effects on Tc.