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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Superconductor01:24

Superconductor

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...
Types Of Superconductors01:28

Types Of Superconductors

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...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...

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関連する実験動画

Updated: May 7, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

(Ba,K) Fe(2) As(2) でほぼ同位型超伝導性を示しています.

H Q Yuan1, J Singleton, F F Balakirev

  • 1Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China. hqyuan@zju.edu.cn

Nature
|January 30, 2009
PubMed
まとめ

鉄-ヒ素化合物の超伝導性は,層状の銅酸化物とは異なり,驚くほど同otropic です. これは,低次元性は高温超伝導性にとって不可欠ではないことを示唆しています.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学

背景:

  • 鉄-ヒ素化合物 (最大56K) で観察された超伝導性は,高温の銅酸化物と比較することを促します.
  • 銅酸化物には層構造と準二次元特性があり,高温超伝導性においてアニゾトロピーは決定的だという理論が提唱されている.
  • 鉄-ヒ素化合物に関する初期の研究は,縮小次元性の必要性を支持するように見えた.

研究 の 目的:

  • 鉄-ヒ素化合物の超伝導性特性のアニソトロピーを調査する.
  • これらの材料における高温超伝導性の前提条件として,縮小された次元性があるかどうかを判断する.
  • 鉄-ヒ素超伝導体の電子構造を,酸化銅の電子構造と比較するために.

主な方法:

  • (Ba,K) Fe (((2) As ((2)) の単結晶における電気抵抗性の測定
  • 60テスラまでの高磁場を適用する.
  • 超伝導体の特性による磁場方向への依存の分析.

主要な成果:

  • (Ba,K) Fe(2) As(2) の超伝導性能は,主に同位体であることが判明しました.
  • 性質は,低温で適用された磁場の方向から独立していることを示した.
  • このイソトロピックな振る舞いは,これまでに知られているすべての層状の超伝導体と大きく対照的です.

さらに関連する動画

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

関連する実験動画

Last Updated: May 7, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

結論:

  • 縮小された次元性は,高温超伝導性の前提条件ではない.
  • 同位体性は,銅酸化物と比較して鉄-ヒ素化合物のより3次元的な電子構造に起因する.
  • 以前の低場データ抽出では,誤って高いアニソトロピーと誇張された臨界場が示唆されていた.