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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Superconductor01:24

Superconductor

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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...
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Types Of Superconductors01:28

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...
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Ferromagnetism01:31

Ferromagnetism

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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...
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Second Uniqueness Theorem01:16

Second Uniqueness Theorem

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Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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,...
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イソトロピック量子散乱と非従来の超伝導性.

T Park1, V A Sidorov, F Ronning

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. tuson@lanl.gov

Nature
|November 21, 2008
PubMed
まとめ

非常識な超伝導性は,フォノンではなく,局所的な量子的臨界点における量子変動から生じる. CeRhIn ((5) のこの発見は,強く相関する材料における電子のペアリングのための新しいメカニズムを明らかにします.

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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 凝縮物質物理学
  • 量子材料は,量子的な物質である.
  • 超伝導性は超伝導性である.

背景:

  • 従来の超伝導性は,フォノンによって媒介されます.
  • 非常識な超伝導性は,磁気不安定性近くの強く相関する電子系における磁気変動から生じると考えられている.
  • 新しいペアリングメカニズムを特定することは,高温超伝導性を理解するために不可欠です.

研究 の 目的:

  • フォノンを超えた波動によって媒介される超伝導性を調査する.
  • 非従来の超伝導性における局所量子臨界点の役割を探求する.
  • 量子材料における電子ペアリングの新たな源を特定する.

主な方法:

  • 強く相関する反鉄磁石CeRhIn ((5) を圧力下で研究した.
  • 電子散乱と電気抵抗性を分析する.
  • 局所量子臨界点における量子変動を調査する.

主要な成果:

  • 超伝導性は,フォノン媒介メカニズムとは異なる局所的な量子的臨界点から発生することが観察されました.
  • 主要な指標は,電荷キャリアのイソトロピック分散と亜線形,温度に依存する抵抗力でした.
  • 臨界点での共存する磁気と電荷の変動は,超伝導性の最適な圧力で最大であることが判明しました.

結論:

  • 局所量子臨界点の変動から発生する,超伝導性のためのペアリンググルーの新しい源が特定されました.
  • この発見は,非従来の超伝導性メカニズムについての理解を広げています.
  • それは,新しい超伝導材料の発見と設計のための新しい道を開きます.