摘要
用标准的固相反应法制备了La0.3Ca0.7Mn1-xWxO3(0.00≤x≤0.15)多晶样品。通过对样品磁化强度?温度(M-T)曲线、磁化强度?磁场强度(M-H)曲线及ESR谱的测量,研究了Mn位W掺杂对La0.3Ca0.7Mn1-xWxO3体系的磁相变的影响。结果表明,随着W掺杂量的增加,体系磁相变发生了复杂的变化过程。当掺杂量为0.00≤x≤0.08时,体系存在电荷有序(CO)相,反铁磁(AFM)/CO态共存于相变温度以下,电荷有序温度(TCO)随着W掺杂量的增加而增加。x≥0.12时,体系电荷有序态逐渐减弱并融化,在极低温度下存在顺磁—铁磁(PM-FM)相变。
Polycrystalline samples of La0.3Cao0.7Mn1-xWxO3 （0. 00≤x≤0. 15） were prepared by conventional solid-state reaction method. The influence of W doping at Mn site on the magnetic transition of La0. 3 Ca0.7 Mn1-x WxO2 system was studied by the measurements of magnetization-temperature （M-T） curves, magnetization-magnetic intenslty（M-H） curves, and ESR spectra. The results show that, with the increase in W doping amount, the magnetic transition of the system exhibits a complicated charge.process, when the doping amount is 0. 00≤x≤0. 08, the charge-ordering（CO） phase exists in the system, AFM/CO states coexist below the transition temperature, and the charge-ordering temperature（Tco） goes up with the increase in W doping content ;when x≥0. 12, the charge ordering （CO） state of the system weakens and melts, and pararnagnetism-ferromagnetism （PM-FM） transition exists at extremely low temperature
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期223-227,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金重点项目(19934003)
国家重点基础研究发展规划项目(001CB610604)
宿州学院教授基金项目(2006jb10)资助
关键词
凝聚态物理
磁相变
电荷有序
建立
融化
稀土
Condensed matter physics
Magnetic transition
Charge ordering
Establishment
Melting
Rare earths.
