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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

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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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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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An interesting property of a conductor in static equilibrium is that extra charges on the conductor end up on its outer surface, regardless of where they originate. Consider a hollow metallic conductor with a uniform surface charge density. Since the conductor itself is in electrostatic equilibrium, there should not be any electric field inside the conductor. Now, assume a Gaussian surface enclosing the hollow portion. Applying Gauss's law, the inner surface of the hollow conductor will not...
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超伝導体は運動量を得る

Eva Pavarini1

  • 1Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany.

Science (New York, N.Y.)
|April 21, 2022
PubMed
まとめ
この要約は機械生成です。

スピン密度調節は,ペロブスキート材料の超伝導性が均一ではないことを明らかにします. 物質の超伝導特性に影響する 複雑な電子的行動を示唆しています

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • 固体化学

背景:

  • ペロブスキート材料は,その多様な電子特性のために重要な関心があります.
  • 超伝導性は,ゼロの電気抵抗という現象で,凝縮物質物理学の重要な研究分野です.
  • 超伝導性の性質を理解することは,均質か不均質かに関わらず,技術的な応用にとって極めて重要です.

研究 の 目的:

  • 特定のペロブスキート材料の電子特性を調査する.
  • 材料内の超伝導性の空間分布を決定する.
  • 非均一な超伝導性を引き起こす可能性のあるメカニズムを特定する.

主な方法:

  • ニュートロン散乱や共振X線散乱などの高度な技術を用いて,スピン密度の調節を検出した.
  • 磁気順序の空間的変異を特定するために 散乱データを分析した
  • 観測されたスピン変調をペロブスキットの超伝導特性と相関させた.

主要な成果:

  • ペロブスキット構造内で明確なスピン密度の調節を観察した.
  • これらの調節は,超伝導状態の空間的に不均一な分布を示しています.
  • この発見は,局所的な電子的または構造的変化が超伝導性に影響することを示唆しています.

結論:

  • スピン密度調節の存在は,このペロブスキットの不均一な超伝導性の強力な証拠を提供します.
  • この不均一性は,競合する電子注文や構造的混乱から生じることがあります.
  • ペロブスキットのスピン調節と超伝導性の相互作用を完全に解明するには,さらなる研究が必要である.