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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 | Affiliation: | 1 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 | Abstract: | High-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 | Services: | Forum | Review | PDF | Favorites |
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