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相关概念视频

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
Types Of Superconductors01:28

Types Of Superconductors

912
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...
912
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
Paramagnetism01:30

Paramagnetism

2.5K
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...
2.5K
Types of Semiconductors01:20

Types of Semiconductors

473
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...
473

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相关实验视频

Updated: May 23, 2025

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
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Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

Published on: August 15, 2015

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在PrNiO2的超导性无限层尼基酸盐.

Hoshang Sahib1, Aravind Raji2,3, Francesco Rosa4

  • 1Universitè de Strasbourg, CNRS, IPCMS UMR 7504, Strasbourg, F-67034, France.

Advanced materials (Deerfield Beach, Fla.)
|March 10, 2025
PubMed
概括

没有使用过的无限层PrNiO2薄膜具有超导性. 这一发现挑战了先前的研究,表明化学兴奋剂对这些酸材料的超导电性并不必不可少.

关键词:
里克斯 (RIXS) 是一个指令.这是一个声音.有无限层的尼基酸盐.超导性是一种超导性.

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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

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 超导电性 超导电性 超导电性

背景情况:

  • 无限层尼基酸盐是一种具有高温超导性潜力的新型材料.
  • 现有的研究表明,形相图取决于化学兴奋剂,类似于cuprates.

研究的目的:

  • 为了研究无兴奋剂无限层PrNiO2薄膜中的超导性.
  • 描述这些薄膜的结构和电子特性.
  • 确定化学兴奋剂在实现超导性的作用.

主要方法:

  • 在SrTiO3基板上生长高质量的未使用的PrNiO2薄膜.
  • 扫描传输电子显微镜 (STEM) 用于结构分析.
  • 射线吸收光谱 (XAS) 用于电子状态的表征.
  • 响应无弹性X射线散射 (RIXS) 用于磁刺激分析.

主要成果:

  • 在未使用片的PrNiO2薄膜中显示出高度可重现的超导状态.
  • STEM证实了一个连贯的无限层阶段,具有高结构质量和最小的缺陷.
  • XAS揭示了Ni 3d轨道在正方形平面几何中的偏好的孔占用.
  • RIXS检测到尖的马格农刺激,与Ni 1+吸收峰值产生共振.

结论:

  • 无限层尼基酸盐薄膜可以在适当稳定时,在没有化学兴奋剂的情况下进行超导.
  • 这些发现表明,在未使用兴奋剂的状态下存在内在的超导性,这挑战了以兴奋剂为中心的模型.
  • 这项工作为探索酸盐系统中的超导性开辟了新的途径.