$R$ -双周$R$ BaMn $_{2}$ O $_{6}$中的位点随机效应
$R$-site Randomness Effect in Double-Perovskite $R$BaMn$_{2}$O$_{6}$
摘要：
我们研究了$R$ /Ba有序的$R$ BaMn $_{2}$ O $_{6}$（$R$ =稀土）的$R$ -位无规效应，用Y $_{1-y}$ La $_y$ BaMn $_2$ O $_6$（0（\leq）$y$（\leq）1），其中$R$（Y，La）和Ba规则排列，而Y和La随机占据$R$ -位. YBaMn $_2$ O $_6$（$y$ = 0）在$T_{\rm CO}$ = 500 K时发生电荷/轨道有序（CO）跃迁，而LaBaMn $_{2}$ O $_{6}$（$y$ = 1）在350 K以下表现出铁磁金属（FM）行为。在0（\leq）$y$（\leq）0.6中，$T_{\rm CO}$随着$y$的增加而降低。在0.6（\leq）$y$（\leq）0.8中，$R$ -位点随机性导致FM、反铁磁（AFM）和CO绝缘（COI）状态之间的强相分离趋势。在相分离区观察到较大的磁电阻。
英文摘要：
We have investigated the $R$-site randomness effect of $R$/Ba-ordered $R$BaMn$_{2}$O$_{6}$ ($R$ = rare earth) by using Y$_{1-y}$La$_y$BaMn$_2$O$_6$ (0 (\leq) $y$ (\leq) 1) in which $R$ (Y,La) and Ba are regularly arranged while Y and La randomly occupy the $R$-site. YBaMn$_2$O$_6$ ($y$ = 0) undergoes charge/orbital ordering (CO) transition at $T_{\rm CO}$ = 500 K while LaBaMn$_{2}$O$_{6}$ ($y$ = 1) shows ferromagnetic metallic (FM) behavior below 350 K\@. In 0 (\leq) $y$ (\leq) 0.6, $T_{\rm CO}$ decreases with an increase in $y$. In 0.6 (\leq) $y$ (\leq) 0.8, $R$-site randomness causes strong phase separation tendencies among the FM, antiferromagnetic (AFM), and CO insulating (COI) states. The large magnetoresistance is observed in the phase separated region.
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