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Related Concept Videos

Superconductor01:24

Superconductor

2.1K
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...
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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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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.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Related Experiment Video

Updated: Apr 6, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride.

Xing-Chen Pan1,2, Xuliang Chen2,3,4, Huimei Liu1,2

  • 1National Laboratory of Solid State Microstructures, College of Physics, Nanjing University, Nanjing 210093, China.

Nature Communications
|July 24, 2015
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Summary

High pressure induces superconductivity in tungsten ditelluride, reaching a critical temperature of 7 K. Theoretical calculations suggest density of states enrichment and structural instability influence this superconducting dome.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Tungsten ditelluride (WTe2) exhibits large unsaturated magnetoresistance, highlighting its unique electronic properties.
  • The material possesses a small, sensitive Fermi surface derived from 5d electronic orbitals.

Purpose of the Study:

  • To investigate the effects of high pressure on the electronic properties of tungsten ditelluride.
  • To induce and characterize superconductivity in tungsten ditelluride under pressure.

Main Methods:

  • Application of high pressure to tungsten ditelluride samples.
  • Measurement of superconducting critical temperature (Tc) as a function of pressure.
  • Theoretical calculations to interpret the observed phenomena.

Main Results:

  • Superconductivity emerges at 2.5 GPa.
  • A maximum critical temperature (Tc) of 7 K is observed around 16.8 GPa, forming a dome-shaped phase diagram.
  • Theoretical analysis indicates Fermi level density of states enrichment at low pressures and potential structural instability at high pressures.

Conclusions:

  • High pressure successfully induces superconductivity in tungsten ditelluride.
  • The observed superconducting dome is explained by pressure-dependent electronic and structural properties.
  • Tungsten ditelluride presents a novel platform for studying superconductivity in transition metal dichalcogenides.