超伝導体:時間逆転対称性破裂?
Sergey V Borisenko1, Alexander A Kordyuk, Andreas Koitzsch
1Institute for Solid State Research, IFW-Dresden, PO Box 270016, 01171, Dresden, Germany. s.borisenko@ifw-dresden.de
Nature
|September 7, 2004
まとめ
クプラテスの擬似ギャップ状態は謎のままである. Bi2212の円形の二重性は,時間逆の対称性破裂ではなく,電子バンドの複製に起因する.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- 超伝導性に関する研究.
- マテリアルサイエンス 材料科学
背景:
- クプレートの擬似ギャップ状態は,凝縮物質物理学の重要な研究分野である.
- この状態の性質を理解することは,超伝導体技術の進歩に不可欠です.
- 以前の研究では,Bi2212.2.の擬似ギャップ状態における時間逆転対称性の破損が示唆されていた.
研究 の 目的:
- cupratesにおける時間逆転対称性破裂に起因する実験観測の解釈を再評価する.
- 低ドーピングのBi2Sr2CaCu2O8+デルタ (Bi2212) で観察された円形の二極化について,代替的な説明を提供するためです.
主な方法:
- Bi2212における電子帯域構造の分析
- 円形の二重化測定の理論的解釈.
- カップレート超伝導体の実験データとの比較.
主要な成果:
- Bi2212で観察された円形の二重性は,自発的な時間逆転対称性破損の兆候ではありません.
- 実験的なシグネチャーは,電子バンドの51つの上部構造の複製によって説明されます.
結論:
- この発見は,時間逆転対称性の破裂に関する以前の実験の解釈に異議を唱えている.
- 偽ギャップ状態とその関連現象の性質を完全に理解するためには,さらなる調査が必要である.
さらに関連する動画
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
6.6K
04:51Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
Published on: July 8, 2021
2.7K
関連する概念動画
The Pauli Exclusion Principle
51.7K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
51.7K
Superconductor
1.9K
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...
1.9K
Types Of Superconductors
1.7K
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...
1.7K
Ferromagnetism
2.8K
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...
2.8K
Symmetry in Maxwell's Equations
2.9K
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
2.9K
Theory of Metallic Conduction
2.0K
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,...
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,...
2.0K
