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関連する概念動画

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...
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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,...
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
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...
Mechanism of heat transfer01:19

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...

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関連する実験動画

Updated: Jun 18, 2026

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

単一の銅-酸素平面における高温超伝導性

G Logvenov1, A Gozar, I Bozovic

  • 1Brookhaven National Laboratory, Upton, NY 11973, USA.

Science (New York, N.Y.)
|November 11, 2009
PubMed
まとめ

研究者らは,超薄なコップレート層で高温超伝導 (HTS) を調査した. HTSは,これらの薄膜内の単一の原子平面でも存在し,新しい超伝導装置の可能性を開くことを発見しました.

科学分野:

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

背景:

  • カップレートにおける高温超伝導 (HTS) の最小厚さの調査は,基本的な理解と技術的な応用にとって極めて重要です.
  • ほぼ完璧な超薄のHTS層を合成し,原子解像度のインターフェイスでそれらの性質を特徴づけることは,重要な実験的課題を提示します.

研究 の 目的:

  • 高温超伝導性を保持する最も薄いカップレート層を決定する.
  • 銅酸金属と断熱器層の間の接点における超伝導性の位置と性質を調査する.
  • 先進的なHTSデバイスの製造の可能性を探求する.

主な方法:

  • 原子層分子ビームエピタキシ (MBE) を利用して,La(1.65) Sr(0.45) CuO4 (金属) とLa2CuO4 (絶縁体) のバイレイヤを合成し,各レイヤの厚さは正確に3ユニットセルです.
  • 併用された同価Zn原子は,選択的に超伝導性を抑制し,プロパティプロファイルのマーカーとして機能するドーパントとして使用されます.
  • 超伝導特性の原子解像度プロファイリングを可能にする技術,例えば,臨界温度や超流体密度などの,インターフェースのプロファイリング.

主要な成果:

  • 銅酸金属の超薄双層と断熱剤を原子精度で合成することに成功しました.

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

Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited Zn1-xMgxO
08:14

Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited
Zn1-xMgxO

Published on: July 31, 2016

関連する実験動画

Last Updated: Jun 18, 2026

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

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

Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited Zn1-xMgxO
08:14

Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited
Zn1-xMgxO

Published on: July 31, 2016

  • 高温超伝導性は,インターフェースの単一のCuO2平面内に存在することを実証しました.
  • Znドーピングは,超伝導性の位置を確認し,その抑制メカニズムについての洞察を提供しました.

    • 結論:

    • カプレートにおける高温超伝導性は,単一の原子層 (CuO2平面) の究極の限界で維持できる.
    • 開発された合成と特徴づけの技術は,超薄膜の界面超伝導性を研究するのに有効です.
    • この研究は,原子的に薄い超伝導層を利用した新しいHTSデバイスの設計と製造の道を開く.