摘要
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、电阻率-温度(ρ-T)曲线及部分样品ESR谱的测量,研究了Mn位W掺杂对CaMn1-xWxO3(x=0.05,0.07,0.10,0.12,0.14,0.16,0.20)体系磁结构的影响。结果表明,随着W掺杂量的增加,体系磁结构发生了复杂的变化过程。当掺杂量x≤0.07时,体系为铁磁(FM),反铁磁(AFM)和顺磁(PM)态的共存,随掺杂量增加,FM态减弱,AFM态增强;当x=0.10,0.12时,体系建立电荷有序(charge ordering,CO)态,AFM/CO态共存于相变温度以下,且电荷有序温度TCO随掺杂量增加而增加;当x≥0.14时,体系电荷有序(CO)态减弱并消失。
The influences of W doping at Mn site on the magnetic structure of CaMn1-x WxO3 （x = 0.05, 0.07, 0.10, 0.12, 0.14, 0.16, 0.20） system were studied by the measurements of magnetization-temperature （M-T） curves, magnetization-magnetic intensity （ M-H ） curves, resistivity-temperature （ρ- T） curves of the samples and of ESR spectra of partial samples. The results show that, with the increase of W doping amount, the magnetic structure of the system exhibits a complicated charge process. When the doping amount is x ≤0.07, the system is in the coexistence of ferromagnetism （FM）, antiferromagnetism （ AFM ） and paramagnetism （ PM ） ; with the increase of the doping amount, FM state weakens and AFM state strengthens. When x = 0.10, 0.12, the system establishes charge ordering （CO） state, AFM/CO states coexist below the transition temperature, and the charge ordering temperature Tco increases with the increase of the doping amount. When x≥0.14, the charge ordering （CO） state of the system weakens and melts.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第1期4-11,共8页
Chinese Journal of Rare Metals
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)
安徽省高等学校自然科学研究项目(2005KJ234)资助
关键词
Mn位W掺杂
磁结构
电荷有序
建立
W doping at Mn site
magnetic structure
charge ordering
establishment
