摘要
研究了Mn位掺Cr体系La0 67Ca0 33Mn1-xCrxO3(0)(0 0≤x≤0 15)的庞磁电阻(CMR),发现Mn位掺Cr时零场电阻率曲线出现附加峰,随着Cr含量的增加,起始电阻率峰值逐渐减弱,附加峰急剧上升。在磁场作用下,两个电阻率峰值被强烈压缩,导致CMR效应中出现双峰,并且CMR效应的温区大大拓宽,从低温到接近室温。这个结果表明:Mn位元素替代是调整CMR效应的有效方法。
To report the extraordinary colossal magnetoresistance (CMR) behavior in Mn-site doped system La_(0.67)Ca_(0.33)Mn_(1-x)Cr_xO_3 (0.00≤x≤0.15). It was found that the substitution with Cr on Mn sites introduces an additional bump in zero-field resistivity curve. With increasing Cr content, this additional bump grows up drastically while the original resistivity peak associated with magnetic order transition diminishes gradually. Under applied magnetic field, both bumps of resistivity are deeply compressed, which leads to the appearance of double-peak in CMR response. As a result, the temperature range of CMR response is significantly broadened, from the lowest to near room temperature. These results prove that Mn-site element substitution could be a potent way in tuning CMR response.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第4期44-46,49,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金重点资助项目(19934003)
国家重点基础研究发展规划资助项目(001CB610604)
关键词
庞磁电阻
输运机制
宽温区CMR
元素替代
colossal magnetoresistance
transport mechanism
CMR of wide temperature range
element substitution
