测量了高质量的单晶膜La2 -xSrxCuO4(x =0 10 ,0 2 0 ,0 2 5 )的电阻率和热电势 .La1 9Sr0 1 CuO4电阻率呈现S型行为 ,表明存在一个赝能隙 ,在赝能隙态可以用公式 ρ =ρ0 +βexp(-Δ T)很好地拟合 .热电势的测量表明 ,在超导转变前样品的残余热电势值非常小 ,这是膜的高质量引起的 ,...
采用共沉淀法制备钙钛矿氧化物La2-xSrxCuO4及LaSrCu1-yWyO4,通过X-射线衍射(XRD)、比表面测定仪(BET)等技术测试钙钛矿样品的晶体结构及比表面积.XRD测试结果表明,对于La2-xSrx CuO4类钙钛矿型氧化物,随着Sr掺杂量的增加,钙钛矿结构的物质杂峰会有所增多;此外,对于LaSrCu1-yWyO4而言,W掺杂量对钙钛矿氧化物的晶...
摘要: 合成了负载在莫来石上x值不同的La2-xSrxCuO4(0≤x≤1)系列复合氧化物,用XRD、SEM等方法研究了这类复合氧化物的结构和氧化还原性能,考察了对N2O分解的催化活性,并对反应的宏观动力学进行了讨论,认为对于N2O的分解是一级反应. 暂无资源 收藏 引用 分享 推荐文章 N2O分解催化剂的制备 分解 催化剂 ...
Micro-probed raman scattering in La2-xSrxCuO4LaSrCuOtwo-magnonmicro analysisThe two-magnon scattering peak in La2-xSrxCuO4 single crystals has been investigated by using a micro-probed Raman scattering technique. The peak intensity and the shape of two-magnon scattering are very sensitive to ...
摘要: 合成了负载在莫来石上x值不同的La2-xSrxCuO4(0≤x≤1)系列复合氧化物,用XRD、SEM等方法研究了这类复合氧化物的结构和氧化还原性能,考察了对N2O分解的催化活性,并对反应的宏观动力学进行了讨论,认为对于N2O的分解是一级反应。关键词: 复合氧化物 N2O 动力学 莫来石 ...
This absorption, the intensity of which increases with Sr doping, implies Sr doping induces electronic states within the gap of La2CuO4. With further Sr doping, the density of states forms a band about 1 eV wide and centered at about 0.5 eV above the top of the original valence band. ...
Energetics of La2-xSrxCuO4-y solid solutions (0.0 ≤ x ≤ 1.0) Compounds in the LaSrCuOseries have been synthesized in the single phase range 0 ≤ x ≤ 1. High temperature solution calorimetry in molten lead borate was used to determine the heats of formation from oxide components. The ...
Two-dimensional short-range spin correlation was studied in LSCO and La 2-xSr xCu 1-yZn yO 4 by means of susceptibility measurement of the normal state. We found that the appearance of the susceptibility maximum coupled with itinerant holes or the disappearance of it due to Zn substitution ...
The preparation of new materials with superlattice, consisting of La2−xSrxCuO4 or Ba2CuO3+y and the infinite layer (Ca1−zSrzCuO2) was studied to obtain CuO2 multilayered new copper-oxides. From the X-ray diffraction patterns and transmission electron microscopy (TEM) images on the (...
The anomalous oxygen isotope shift observed in the high-temperature superconductors La2−xSrxCuO4 and La2−xBaxCuO4 is discussed within the model