|
|||||
|
|
| 钙钛矿锰氧化物La0.7Sr0.3MxMn1-xO3(M=Cr,Fe)的巨磁电阻效应与磁性 | |
| 引用本文： | 李宝河,鲜于文旭,万欣,张健,沈保根.钙钛矿锰氧化物La0.7Sr0.3MxMn1-xO3(M=Cr,Fe)的巨磁电阻效应与磁性[J].物理学报,2000,49(7). |
| 作者姓名： | 李宝河 鲜于文旭 万欣 张健 沈保根 |
| 作者单位： | 1. 北京工商大学数理部,北京,100037;中国科学院物理研究所磁学国家重点实验室,北京,100080 2. 吉林大学物理系,长春,120023 3. 北京工商大学数理部,北京,100037 4. 中国科学院物理研究所磁学国家重点实验室,北京,100080 |
| 基金项目： | 国家自然科学基金! (批准号 :5 95 2 5 10 1) |
| 摘 要： | 研究了溶胶 -凝胶法制备氧化物巨磁电阻材料的工艺 ,制备了La0 .7Sr0 .3 CrxMn1-xO3 (x =0 ,0 .10 ,0 .15 )和La0 .7Sr0 .3 FexMn1-xO3 (x =0 .0 5 ,0 .10 ,0 .16 )两系列的单相钙钛矿锰氧化物多晶样品 ,并研究了Cr ,Fe替代La0 .7Sr0 .3 MnO3 中部分Mn后对其结构、磁性和巨磁电阻性质的影响 .观察到La0 .7Sr0 .3 Cr0 .15Mn0 .85O3 和La0 .7Sr0 .3 Fe0 .0 5Mn0 .95O3 两个样品的电阻 温度曲线都出现了双峰 .定性讨论了可能产生双峰的机制 .随Cr(或Fe)替代量的增加 ,材料的居里温度很快下降 ,铁磁性减弱 ,导电性降低 ,巨磁电阻效应增强 .但与Fe掺杂相比 ,相同数量的Cr掺杂对材料的影响要小 . |
| 关 键 词： | 巨磁电阻效应 溶胶-凝胶工艺 电阻-温度曲线 金属绝缘体转变 |
COLOSSAL MAGNETORESISTANCE EFFECTS AND MAGNETIC PROPERTIES OF La0.7Sr0.3MxMn1-xO3 (M=Cr,Fe) |
|
| LI BAO-HE,XIAN-YU WEN-XU,WAN XIN,ZHANG JIAN,SHEN BAO-GEN.COLOSSAL MAGNETORESISTANCE EFFECTS AND MAGNETIC PROPERTIES OF La0.7Sr0.3MxMn1-xO3 (M=Cr,Fe)[J].Acta Physica Sinica,2000,49(7). | |
| Authors: | LI BAO-HE XIAN-YU WEN-XU WAN XIN ZHANG JIAN SHEN BAO-GEN |
| Abstract: | This paper discusses the preparation of the colossal magnetoresistance samples La 0.7 Sr 0.3 Cr x Mn 1- x O 3 ( x =0, 0.10, 0.15) and La 0.7 Sr 0.3 Fe x Mn 1- x O 3 ( x =0.05,0.10,0.16) by the sol gel technique. The effects that the substitution of Cr or Fe for Mn in La 0.7 Sr 0.3 MnO 3 affects its structure, magnetic properties and magnetoresistance are also studied. Two peaks are observed on the resistance\|temperature curves ( R\|T curves) of the two samples La 0.7 Sr 0.3 Cr 0.15 Mn 0.85 O 3 and La 0.7 Sr 0.3 Fe 0.05 Mn 0.95 O 3. The mechanism for the potential appearance of the double peaks is discussed. A conclusion is drawn that with the increase of Cr (or Fe) substituting for Mn, the samples' Curie temperature ( T C), ferromagnetism and conductivity decrease, whereas their magnetoresistance strengthens. However, the same amount of Cr produces less effect on the samples than the same amount of Fe. |
| Keywords: | CMR effect sol\|gel technology R\|T curve metal\|insulator transition |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《物理学报》浏览原始摘要信息 | |
| 点击此处可从《物理学报》下载免费的PDF全文 | |
