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関連する概念動画

Types Of Superconductors01:28

Types Of Superconductors

980
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...
980
Superconductor01:24

Superconductor

1.1K
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...
1.1K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.3K
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,...
1.3K
Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

934
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
934
Types of Semiconductors01:20

Types of Semiconductors

600
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
600

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関連する実験動画

Updated: Jul 4, 2025

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

Published on: July 8, 2021

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磁気トポロジック断熱器におけるインターフェース誘発超伝導

Hemian Yi1, Yi-Fan Zhao1, Ying-Ting Chan2

  • 1Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA.

Science (New York, N.Y.)
|February 8, 2024
PubMed
まとめ

研究者は,インターフェース誘発超伝導性を観察して,磁気トポロジカル分離器/鉄カルコゲニドヘテロ構造を合成した. この発見は,キラル・トポロジカル・スーパー伝導性とマジョラーナ物理学の探索の道を開く.

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

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

Published on: March 24, 2019

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関連する実験動画

Last Updated: Jul 4, 2025

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

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子現象について

背景:

  • 物質の間のインターフェースは 新しい量子現象を現すことができます
  • トポロジカル・アイソレーター (TI) はユニークな電子特性を有しています.
  • 磁気ヘテロ構造は 奇特な量子状態を 探求する鍵です

研究 の 目的:

  • 鉄磁気トポロジカル分離体と反鉄磁気鉄カルコゲニド (FeTe) のヘテロ構造を合成し,研究する.
  • 磁気材料の交差点にある 超伝導性を探求する
  • 超伝導性,鉄磁気性,およびトポロジカルバンド構造がキラルトポロジカル超伝導性 (TSC) に共存することを実証する.

主な方法:

  • 高品質のヘテロ構造を合成するために分子ビームエピタキシ (MBE) を利用した.
  • 鉄磁気トポロジカル断熱器を反鉄磁気FeTeで積み重ねることでヘテロ構造を製造する.
  • 合成されたヘテロ構造の電子および磁性特性を特徴づけた.

主要な成果:

  • 磁気 TI/FeTe ヘテロ構造における出現したインターフェース誘発超伝導性が観察された.
  • 磁気Ti層における超伝導性,鉄磁気性,およびトポロジカルバンド構造の共存を示した.
  • 超伝導性は高磁場でも保たれていて パウリーの限界を超えています

結論:

  • 合成された磁性 TI/FeTe ヘテロ構造は,キラル・トポロジカル・スーパー伝導性 (TSC) を研究するための堅固な基盤を提供します.
  • これらの材料は,超伝導性,鉄磁気性,およびトポロジカルバンド構造を含むTSCの重要な成分を示しています.
  • この発見は,マイオラナの物理をワッフルスケールシステムで探求するための道を開きます.