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Superconductor01:24

Superconductor

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...
Types Of Superconductors01:28

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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...
Ferromagnetism01:31

Ferromagnetism

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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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超伝導体SmFeAsO0.85F0.1515のBCSのような隙間がある

T Y Chen1, Z Tesanovic, R H Liu

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Nature
|June 6, 2008
PubMed
まとめ

研究者らは,アンドリーフ光譜を用いて,SmFeAsO ((0.85) F ((0.15)) の単一の超伝導ギャップを観測した. この発見は,バーディン-クーパー-シュリーファー (BCS) 理論と一致しているが,高温の酸化銅超伝導体とは異なる.

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:

  • 銅酸化物における高過渡温度 (高Tc) 超伝導性は,CuO2) 平面に依存しています.
  • オキシプニクチド超伝導体の新しいクラスであるLaFeAsO{1-x) F{x}にはCuO{2}平面が欠け,代替のペアリングメカニズムが示唆されている.
  • 超伝導ギャップの性質は,ペアリングメカニズムを理解するために不可欠です.

研究 の 目的:

  • オキシプニクチド超伝導体SmFeAsO ((0.85) F ((0.15)) の超伝導ギャップを調査する.
  • 観測されたギャップの振る舞いを,バーディーン・クーパー・シュリーファー (BCS) 理論と酸化銅超伝導体と比較する.
  • ギャップのパラメータの性質 (ノード性/無ノード性,イソトロピー性/アニソトロピー性) を決定する.

主な方法:

  • アンドリエフ光譜法を使用して,超伝導的ギャップを測定しました.
  • ギャップの温度依存性が研究されました.
  • 2Delta/k ((B) T ((c)) の比率を計算し,理論的な予測と比較した.

主要な成果:

  • SmFeAsO ((0.85) F ((0.15) で T ((c) = 42 K の単一の超伝導ギャップが観察されました.

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  • ギャップ値は2Delta = 13.34 +/- 0.3 meVで,2Delta/k(B) T(c) = 3.68で,BCS予測 (3.53) に近い値となっている.
  • このギャップはBCSに一致する温度依存を示しており,銅酸化物における偽ギャップとは異なり,ノードがなく,ほぼ同otropicである.

    • 結論:

    • この結果は,SmFeAsO ((0.85) F ((0.15)) のペアリングメカニズムが銅酸化物超伝導体とは異なることを示唆している.
    • 観測されたノードレスでほぼ同位体差は,反鉄磁気変動や高T (c) 酸相に関連した強い相関に基づくモデルと相容れない.
    • この研究は,鉄基オキシプニクチドにおける超伝導性の根本的な性質についての重要な洞察を提供します.