摘要
采用传统的固相反应法在较低的烧结温度与较短的煅烧时间下制备了(La1.85Sr0.15CuO4)1-x(La2/3Sr1/3MnO3)x(简写为LSCO/LSMO)超导/铁磁复合材料。结果显示:复合后LSMO中的结构没有发生明显改变,随着温度的降低,所有的复合材料在38 K左右均会出现电阻急剧下降,最终呈现超导现象。甚至当LSMO铁磁性材料掺入达到0.20 mol时,复合材料仍旧呈现超导态。同时所有复合样品的超导转变温度TC随着x的增加呈现线性下降的趋势。因此,通过低温与短时的烧结方法可以避免处于晶界处的LSCO的CuO面被破坏,进而提高超导/铁磁复合材料中在晶界处的铁磁的共存含量。
The composites of（La1.85Sr0.15CuO4）1-x（La2/3Sr1/3MnO3）x（LSCO/LSMO）,x is mole fraction） were prepared by a solid-state reaction method under the low calcining temperature and short holding time.The results indicated that the characteristics of non-solidsolution matrix composites and the phase coexistence of LSCO cuprates and LSMO manganites were compatible with each other for the composite samples.As temperature decreased,the resistivity of all the composites decreases abruptly at about 38 K,manifesting the occurrence of superconductivity.The superconductivity still existed in the composites even though plenty of LSMO was introduced into LSCO superconducting cuprate.TC of all the composites decreased linearly with increasing x.The preparation method of the low calcining temperature and short holding time may protect the CuO2 planes in the grain boundary from being destroyed so that there was more ferromagnetism of LSMO coexistence with superconductivity of LSCO at the same time.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2011年第3期748-751,共4页
Journal of Synthetic Crystals
基金
国家自然科学基金(11074163)
上海市科学技术委员会重大基础研究计划项目(08dj1400202)
关键词
锰氧化物
高温超导
超导与铁磁共存
manganite
HTS
coexistence of superconductivity and ferromagnetic
