La_(0.3)Ca_(0.7)Mn_(1-x)W_(x)O_(3)体系的电荷序和自旋序

摘要

通过对样品La_(0.3)Ca_(0.7)Mn_(1-x)W_xO_3(x=0.00,0.04,0.08,0.12,0.15)的M-T曲线、M-H曲线及ESR谱的测量,研究了Mn位W掺杂对La_(0.3)Ca_(0.7)MnO_3体系电荷序和自旋序的影响.结果表明:当0.00≤x≤0.08时,体系出现电荷有序(CO)相,体系自旋序随着温度的降低发生顺磁(PM)-电荷有序(CO)-反铁磁(AFM)变化;当x≥0.12时,CO相融化,并有部分CO相残留在PM背景中,体系自旋序主要是顺磁(PM),在低温下出现铁磁(FM)团簇.