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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

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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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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Theory of Metallic Conduction01:17

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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Approaching Two-Dimensional Superconductivity in Ultrathin DyBa_{2}Cu_{3}O_{7-δ}.

R D Dawson1, K S Rabinovich1, D Putzky1

  • 1Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.

Physical Review Letters
|December 18, 2020
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Ultrathin DyBa2Cu3O7-δ films exhibit universal superfluid density behavior above 10 unit cells. Thinner films show Berezinskii-Kosterlitz-Thouless transitions, indicating a non-superconducting interfacial layer.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Superconductivity

Background:

  • Superfluid density (ρs(T)) is a key parameter in understanding superconductivity.
  • Ultrathin films offer unique properties due to quantum confinement and surface effects.
  • Dysprosium barium copper oxide (DyBa2Cu3O7-δ) is a high-temperature superconductor with potential applications.

Purpose of the Study:

  • To investigate the temperature dependence of superfluid density in ultrathin DyBa2Cu3O7-δ films.
  • To explore the influence of film thickness on superconducting properties.
  • To identify the nature of the interfacial layer in these ultrathin films.

Main Methods:

  • Submillimeter wave interferometry
  • Time-domain terahertz spectroscopy
  • Infrared ellipsometry
  • Molecular Beam Epitaxy (MBE) for film growth

Main Results:

  • Films 10 unit cells (u.c.) and thicker show universal ρs(T) temperature dependence, matching single-crystal YBa2Cu3O7-δ critical behavior.
  • Seven u.c. thick films exhibit a steep decline in ρs(T) near Tc, consistent with Berezinskii-Kosterlitz-Thouless transitions.
  • Evidence suggests a 4 u.c. non-superconducting interfacial layer, with a quasi-2D superconducting layer above it.

Conclusions:

  • The superconducting state in the interfacial layer is likely suppressed by competing orders, possibly charge order.
  • The findings provide insights into the fundamental physics of superconductivity in ultrathin films.
  • This research contributes to the understanding of interfacial effects in complex oxide heterostructures.