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The Pauli Exclusion Principle03:06

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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:
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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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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Superconductor01:24

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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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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超伝導性のない電子のペアリング.

Guanglei Cheng1, Michelle Tomczyk1, Shicheng Lu1

  • 11] Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA [2] Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.

Nature
|May 15, 2015
PubMed
まとめ
この要約は機械生成です。

研究者らは,ストロンチウムチタナート (SrTiO3) で,電子が超伝導性なしにペアアップする新しい電子相を発見しました. この発見は,非常識な電子ペアリングメカニズムと超伝導性の前身についての新しい洞察を提供します.

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 超伝導性は超伝導性である.

背景:

  • ストロンチウムチタネート (SrTiO3) は超伝導半導体であり,ユニークな相図があり,従来とは異なる電子のペアリングを示唆しています.
  • SrTiO3の電子ペアリングのメカニズムを理解することは,50年間,長期にわたる課題でした.

研究 の 目的:

  • SrTiO3.3における電子対の性質を実験的に調査する.
  • この材料における電子ペアリングと超伝導性の関係を探求する.

主な方法:

  • SrTiO3/LaAlO3インターフェイスでナノワイヤベースの単電子トランジスタを使用した輸送実験.
  • 静電ゲーティングは,電子の状態と磁場への反応を検知するためのものです.

主要な成果:

  • 観測された2電子導電共鳴 (ペア電子状態) は,最大900mKまで安定している.
  • 電子のペアリングが,超伝導的臨界場と異なる臨界場 (Bp ≈ 1-4 T) の上方に二分化することを示した.
  • ペア状態のフィールド依存の振る舞いを示し,Bp.の上の線形ジーマンのような分割を示した.

結論:

  • 超伝導に先立つペアリングされた電子を持つ堅固な電子相の存在.
  • この発見は,ハバード相互作用が現実空間における電子のペアリングを誘導するモデルを裏付けている.
  • この研究は,超伝導体における非常識なペアリングメカニズムに関する重要な実験的洞察を提供します.