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29 March 2024
 
  » arxiv » cond-mat/0501575

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New class of T-prime-structure cuprate superconductors
A. Tsukada ; Y. Krockenberger ; M. Noda ; H. Yamamoto ; D. Manske ; L. Alff ; M. Naito ( NTT Basic Research Laboratories ; Atsugi ; Japan ; MPI for Solid State Research ; Stuttgart ; Germany ; Tokyo University of Science ; Yamazaki ; Japan ; Vienna University of Technology ; Vienna ; Austria ; Tokyo University of Agriculture ; Technology ;
Date 24 Dec 2004
Journal Solid State Comm. 133, 427 (2005)
Subject Superconductivity | cond-mat.supr-con
Affiliation1 and 2), M. Noda (1 and 3), H. Yamamoto , D. Manske , L. Alff , M. Naito (1 and 5) ( NTT Basic Research Laboratories, Atsugi, Japan, MPI for Solid State Research, Stuttgart, Germany, Tokyo University of Science, Yamazaki, Japan, Vienna University
AbstractHigh-temperature superconductivity has been discovered in La2-xBaxCuO4 [1], a compound that derives from the undoped La2CuO4 crystallizing in the perovskite T-structure. In this structure oxygen octahedra surround the copper ions. It is common knowledge that charge carriers induced by doping in such an undoped antiferromagnetic Mott-insulator lead to high-temperature superconductivity [2- 4]. The undoped material La2CuO4 is also the basis of the electron-doped cuprate superconductors [5] of the form La2-xCexCuO4+y [6,7] which however crystallize in the so called T-prime-structure, i.e. without apical oxygen above or below the copper ions of the CuO2-plane. It is well known that for La2-xCexCuO4+y the undoped T-prime-structure parent compound cannot be prepared due to the structural phase transition back into the T-structure occuring around x ~ 0.05. Here, we report that if La is substituted by RE = Y, Lu, Sm, Eu, Gd, or Tb, which have smaller ionic radii but have the same valence as La, nominally undoped La2-xRExCuO4 can be synthesized by molecular beam epitaxy in the T-prime-structure. The second important result is that all these new T-prime-compounds are superconductors with fairly high critical temperatures up to 21 K. For this new class of cuprates La2-xRExCuO4, which forms the T-prime-parent compounds of the La-based electron doped cuprates, we have not been able to obtain the Mott-insulating ground state for small x before the structural phase transition into the T-structure takes place.
Source arXiv, cond-mat/0501575
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