Topic: Superconductors After reading the provided article, Describe in detail le

Question

Topic: Superconductors

After reading the provided article,

Describe in detail least two new ideas,concepts,relationships,methods that you have learned from this paper.

Since the discovery of high-temperature superconduc- Our synthetic strategy for the new single-layer Cu-O ) in copper oxide compounds by Bednor and Mller, unprecedented extensive efforts have been well-known examples of copper oxide compounds with devoted to synthesizing new superconducting copper oxide single-layer shee compounds with higher Te. Some The K2NiF4 structure in I known, realizing higher-T c La2Cuo and the Nd CuO4 structure or the so-called T ductors, e.g., Y-Ba-Cu-O (Ref. 2) and Bi(TID-Sr(Ba) Sm, Eu, and Gd. Whether rare-earth metal copper oxides sheets structure seems to be critically dependent on the ionic r which comprise Cu-O pyramidal quentially dius of constituent rare-earth on. In particular ordered noncopper cations along the normal to the CuO2 planes. In this Brief Report, we describe the design and phase is only stabilized for the largest La ion among rare earth trivalent ions. The relatively large Pr (and Nd) ions form the solid solution with the largest I pounds, partially Sr-substituted L La Cuo4, where L La2-Pr,Cuo and Laz-Nd,Cu, over the whole stands for Sm, Eu, and Gd: The new compounds are com- posed of the single-layer sheets of Cu-O pyramids, as shown in Fig. 1(a), and show the sequential ordering of the cations in such a way as -La-La-L-L-1. We found that the Sr-doping into the mother compound LLaCuo4 stabilizes the new structure, which we w call the T phase hereafter, and makes the compounds metal lic (and possibly superconducting, if we can diminish oxy gen vacancies). The new compounds form essentially the same Cu-O network as the 30-K superconductor Ndz-x-Ce,Sr, Cu04 discovered by Akimitsu et al., which shows the partial ordering of Nd and Sr as shown in Fig. b). The T* phase compound is possibly the sim plest system among the Cu-O pyramidal sheet compounds ducting) copper oxide compounds with single-layer CuO2 sheets: and, hence, will provide a unique opportunity for investi gating multisheet compounds with higher Te but with more com phase); and (d) Lz-Ce,Cuo (T pha FIG. . Crystal structures of metallic (and possibly supercon- basic physical properties relating to the existing NdCeSr CuO (T* phase): (c La-Sr,Cu4 C7 u,

Explanation / Answer

Two major concepts of this paper

1. Design and synthesis of a new family of layer copper oxide compound is reported in this paper.

2. The detailed structure for the above compound is reported by means of characterization studies such as high resolution lattice imaging.

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