【摘 要】
：
A series ofGa doping perovskite cobaltite La2/3Sr1/3(Co1-yGay)O3 (y=0,0.1,0.2,0.3 and 0.4) are prepared by the standard solid-state reaction method. Their magne
【机 构】
：
College of Physics and Information Technology, Chongqing Normal University, Chongqing 400044“,”Depar
论文部分内容阅读
A series ofGa doping perovskite cobaltite La2/3Sr1/3(Co1-yGay)O3 (y=0,0.1,0.2,0.3 and 0.4) are prepared by the standard solid-state reaction method. Their magnetic properties and Co ions spin state transitions are studied. Upon doping, no appreciable structure changes can be found. However, the corresponding Curie temperature sharply decreases and the magnetization is greatly reduced, indicating that Ga doping destroys the ferromagnetic interaction in the system. In addition, the high temperature magnetization data follow the Curie-Weiss law. At least one kind of Co ions (Co3+ or Co4+) favours the mixed spin state, and most Co ions are at the lower spin state (low and intermediate state). With increasing Ga content, more Co ions transit to the higher spin state.
其他文献
天空降水是我县水稻需水的主要来源,尤其是在目前灌溉能力较差的情况下,降水量的多少对水稻产量影响极大。因此,研究降水量的时空分布特征及其变化规律,对充分利用水分资源,
We study the anti-phase synchronization (APS) in a system of two coupled chaotic oscillators. The necessary condition and the stability analysis for the APS are
The characteristics of magnetohydrodynamic fast wave propagation in the solar stratified atmosphere are studied by the ray tracing method.
We adopt a recently developed relativistic kappa-loss-cone (KLC) distribution to model energetic electrons energy spectra observed at the geostationary orbit in
By introducing the entangled state representation and Feynman assumption that electron pairs are bosons, ..., a bound pair acts as a Bose particle, we construct
“互联网+”是互联网思维的深化,也是创新2.0下互联网发展的新业态,这并不意味着简单的结合,而是从内容到形式,由表及里,将互联网思维充分内化。互联网第一代web1.0实现了从
在许多情况下,大量施用无机肥料往往不能获得预期的增产效果。与其它因素一样,土壤中微量元素不足可能是其中的一个原因。微量元素在吸收无机营养、水分和调节植物生长与发
近年来随着过内外经济发展形势的复杂变化,企业面临的经营压力和发展挑战不断增加,如何处理好企业在发展过程中与员工之间的关系成为当下提高企业综合实力的一个重要保障.因
丝黑穗病菌(Sphacelotheca reilia-na [kuhn] Clint)能够侵染高粱、苏丹草和玉米。从高粱分离的丝黑穗病菌除能侵染高粱外,还能侵染玉米的一些栽培品种。但从玉米分离的丝黑
研究二棱大麦产量构成因素的相对作用及左右产量的关键因子,对于明确不同生产水平条件下二棱大麦的增产技术途径和高产栽培措施有着极为重要的实践意义和指导作用,本文根据