论文标题
掺杂剂价的显着影响$ - $ $ cabaco $ _ {3.96} $ cr $ _ {0.04} $ o $ $ _7 $和cabaco $ _ {3.96} $ ni $ _ {0.04}
Remarkable effects of dopant valency $-$ a comparative study of CaBaCo$_{3.96}$Cr$_{0.04}$O$_7$ and CaBaCo$_{3.96}$Ni$_{0.04}$O$_7$
论文作者
论文摘要
使用杂质级别1％掺杂cr $^{3+} $和ni $^{2+} $ in Cabaco $ _4 $ o $ $ _7 $，讨论了掺杂量的独特效果。通过比较研究多种表皮Cabaco $ _ {3.96} $ CR $ _ {0.04} $ o $ $ _7 $和cabaco $ _ {3.96} $ _ {3.96} $ ni $ _ $ _ {0.04} $ $ $ $ $ _7 $，我们在cr上差异很大，并且在范围内差异很大半径与Co $^{3+} $和CO $^{2+} $相比，Ni掺杂会引起壮观的变化。特别是，电动极化的多种增加变化高达650 $ {\rmμ} $ c/m $ $^2 $ 5.6 kV/cm，在cabaco $ _ {3.96} $ _ {3.96} $ ni $ _ {0.04} $ _ {0.04} $ o $ $ $ _7 $与cabaco $ _ $ _ $ _ $ _ $ _ $ _ $ _ {0.04}磁电耦合导致$ \ sim在15吨磁场和40 k以下的极化变化$ 12％。此外，在磁性转变的温度范围内，磁性纤维效应提示了竞争磁相。我们根据可能的网站选择性掺杂的掺杂，在三角形和kagomé层中分别讨论了观察到的差异。
Distinctive effects of dopant valency is discussed using an impurity level 1% doping each of Cr$^{3+}$ and Ni$^{2+}$ in CaBaCo$_4$O$_7$. Through a comparative study of the magnetic and dielectric properties of multiferroic CaBaCo$_{3.96}$Cr$_{0.04}$O$_7$ and CaBaCo$_{3.96}$Ni$_{0.04}$O$_7$, we highlight that Cr doping does not significantly alter the properties in spite of differences in magnetic spin and ionic radius compared to Co$^{3+}$ and Co$^{2+}$ while Ni doping induces spectacular changes. Particularly, a manifold increase of electric polarization change up to 650 ${\rm μ}$C/m$^2$ at 5.6 kV/cm is observed in CaBaCo$_{3.96}$Ni$_{0.04}$O$_7$ compared to CaBaCo$_{3.96}$Cr$_{0.04}$O$_7$ and a stronger magnetoelectric coupling leading to a polarization change of $\sim$ 12% in 15 T magnetic field and below 40 K. Further, magnetodielectric effects hint to competing magnetic phases over the temperature range of magnetic transitions. We discuss the observed disparity in the light of a possible site selective doping of Cr$^{3+}$ and Ni$^{2+}$ in the triangular and kagomé layers, respectively, of the parent compound.
