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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

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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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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.
CFT focuses on...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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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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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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Related Experiment Video

Updated: May 29, 2025

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Upper critical fields in high-Tcsuperconductors.

Wei Wei1, Yuling Xiang1, Qiang Hou1

  • 1Department of Physics, Southeast University, Nanjing 211189, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 6, 2025
PubMed
Summary
This summary is machine-generated.

Understanding high-temperature superconductivity is key. This review compares the upper critical field (Hc2) in cuprates, iron-based, and nickelate superconductors to reveal insights into unconventional pairing mechanisms.

Keywords:
cuprate superconductorshigh-temperature superconductivityiron-based superconductorsnickelate superconductors

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • High-temperature superconductivity, particularly in cuprates, presents a significant challenge in understanding its unconventional pairing mechanism.
  • The upper critical field (Hc2) is a critical parameter for elucidating pair-breaking mechanisms, coherence length (ξ), and pairing symmetry.

Purpose of the Study:

  • To review studies on the upper critical field (Hc2) in representative cuprate, iron-based, and nickelate superconductors.
  • To compare the behavior of Hc2 across these three classes of materials as a function of temperature, doping, and anisotropy.

Main Methods:

  • Literature review of experimental studies on upper critical fields (Hc2).
  • Comparative analysis of Hc2 behavior across different high-temperature superconductor families.

Main Results:

  • The review synthesizes existing data on Hc2 in cuprates, iron-based, and nickelate superconductors.
  • Comparative analysis highlights similarities and differences in Hc2 dependence on temperature, doping, and anisotropy.

Conclusions:

  • Understanding the upper critical field (Hc2) is crucial for deciphering unconventional pairing mechanisms in high-temperature superconductors.
  • Comparing Hc2 across cuprates, iron-based, and nickelate superconductors offers valuable insights into their complex superconducting interactions.