Development of Novel Superconductors Using the Chemistry of Arsenic(Current Topics)

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Other Title
  • ヒ素の化学を利用した鉄系超伝導体の新物質開発(最近の研究から)
  • ヒ素の化学を利用した鉄系超伝導体の新物質開発
  • ヒソ ノ カガク オ リヨウ シタ テツケイ チョウデンドウタイ ノ シン ブッシツ カイハツ

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Abstract

Comparable energy of the Cu 3d and O 2p orbitals in copper oxides provides a platform for high-temperature superconductivity, known as a charge-transfer insulator. Even in iron-based superconductors, the Fe 3d and As 4p orbitals are energetically close, which induce the formation/breaking of As-As bonds depending on the filling of the Fe 3d band. CaFe_2As_2 represents a typical example of this case, where the disappearance/appearance of superconductivity results from the formation/breaking of As-As bonds along the c-axis by a change in the electronic dimensionality. In Ca_<10>(Pt_4As_8) (Fe_<2-x>Pt_xAs_2)_5, in-plane As-As bonds are formed, resulting in high-temperature superconductivity at 38 K. In SrPt_2As_2, all the As-As bonds are broken, and a stack of alternate normal PtAs layers and inverse AsPt layers is created. As a result, charge transfer occurs from the AsPt layer to the PtAs layer, giving rise to an insulating AsPt layer and a pseudo-two-dimensional electronic system in the PtAs layer. Thus, superconductivity is observed at 5.2 K. This report serves as an introduction to the tuning of the electronic state and material design for a high-temperature superconductor using the chemistry of arsenic, with the abovementioned three compounds as examples.

Journal

  • Butsuri

    Butsuri 68 (4), 226-231, 2013-04-05

    The Physical Society of Japan

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