New family of layered copper oxide compounds with ordered cations: Prospective high-temperature superconductors

Y. Tokura; H. Takagi; H. Watabe; H. Matsubara; S. Uchida; K. Hiraga; T. Oku; T. Mochiku; H. Asano

doi:10.1103/PhysRevB.40.2568

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New family of layered copper oxide compounds with ordered cations: Prospective high-temperature superconductors

Y. Tokura, H. Takagi, H. Watabe, H. Matsubara, S. Uchida, K. Hiraga, T. Oku, T. Mochiku, H. Asano

DOI 10.1103/PhysRevB.40.2568 · Physical Review B

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Abstract

A new family of layered copper oxide compounds with ordered rare-earth cations has been designed and synthesized. The compounds are partially Sr-substituted L1La1CuO4, where L(=Sm, Eu, and Gd) and La ions are sequentially ordered thus: [-L-L-La-La-]. As a result, the Cu-O network of the new compound forms single-layer sheets of CuO5 pyramids, which is essentially the same as in the 30-K superconductor (Nd,Ce,Sr)2CuO4 discovered recently by Akimitsu et al. Extensive oxygen annealing makes the new compounds metallic, indicating their possibility as a new class of high-temperature superconductors with hole-type charge carriers.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nd2-x-zCexSrzCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
Nd2-x-yCexSryCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown