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相关概念视频

Types Of Superconductors01:28

Types Of Superconductors

1.1K
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...
1.1K
Superconductor01:24

Superconductor

1.2K
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...
1.2K
Diamagnetism01:26

Diamagnetism

2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.5K
Ferromagnetism01:31

Ferromagnetism

2.5K
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...
2.5K
Schottky Barrier Diode01:27

Schottky Barrier Diode

498
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
498
Paramagnetism01:30

Paramagnetism

2.6K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K

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在替代磁铁中完美的超导二极管效应.

Debmalya Chakraborty1, Annica M Black-Schaffer2

  • 1Indian Institute of Science Education and Research (IISER) Mohali, K. K. Birla Goa Campus, Birla Institute of Technology and Science-Pilani, Max Planck Institute for the Physics of Complex Systems, Uppsala University, Department of Physics and Astronomy, Box 516, S-751 20 Uppsala, Sweden; , Nöthnitzer Straße 38, 01187, Dresden, Germany; Department of Physics, NH-17B, Zuarinagar, Sancoale, Goa-403726, India; and Department of Physical Sciences, Sector 81, S.A.S. Nagar, Manauli PO 140306, India.

Physical review letters
|July 31, 2025
PubMed
概括

我们在d波变磁体中发现了超导二极管效应,实现了高效率. 观察到完美的二极管效率与外部磁场,与拓过渡相关.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 量子材料科学 量子材料科学

背景情况:

  • 超导二极管效应 (SDE) 能够使超导体中的电流得到纠正.
  • 变磁体是一种磁性材料,由于它们的对称性,它们具有独特的电子特性.
  • 非传统的超导,就像d波配对一样,呈现出超越传统BCS理论的复杂现象.

研究的目的:

  • 为了研究d波变磁体中的内在超导二极管效应 (SDE).
  • 探索有限动量配对和外部磁场对SDE的影响.
  • 了解这些材料中SDE的基本机制,包括拓过渡,控制这些材料的SDE.

主要方法:

  • 超导二极管效应的理论研究.
  • 对d波变磁体相位图的分析.
  • 超导状态与零动量 (BCS) 和有限动量配对的建模.
  • 对拓学节点到无节点过渡的检查.

主要成果:

  • 在d波变磁体的有限动量配对模式中观察到较大的二极管效率.
  • 在外部磁场的存在下,实现了完美的二极管效率 (100%).
  • 最高的效率与零动量和有限动量的超导状态之间的竞争相关.

结论:

  • 本质的超导二极管效应在d波变磁体中是显著的.
  • 外部磁场可以通过调整拓性质来诱导完美的二极管效率.
  • 这些发现为基于变磁和超导的新型电子设备提供了途径.