钙掺杂双铁性YCrO3中小极化子的形成机制
Mechanism of small-polaron formation in the biferroic YCrO3 doped with calcium
摘要：
通过X射线衍射、磁化率和电导率测试研究了Ca掺杂对YCrO 3陶瓷结构、磁性和电学性能的影响。作为Ca掺杂的电荷补偿的结果，通过从Cr（III）到Cr（IV）的变化发生电池体积减小。没有观察到的反铁磁转变温度的变化，而强烈的变化，观察到由于Ca含量的运输测量。电导率的增加以及激活能的降低是由于O-Cr-O晶格畸变中局域化的小极化子的形成。未掺杂样品中的小极化子的起源与钙掺杂样品中的小极化子的起源在性质上不同。“局部非中心对称性”是未掺杂样品中小极化子形成的来源，而通过Ca（II）在Y（III）位的电荷补偿从Cr（III）到Cr（IV）的变化是小极化子形成的来源。的平均键长Cr-O以及在顺磁状态和电导率的增加的有效时刻的减少是明确的证据表明，Ca掺杂诱导局部极化子，这反过来，这些准粒子从网站移动到网站的热激活过程中掺杂的YCrO 3化合物。在这里，我们还讨论了一种可能的机制，小极化子注入YCrO 3矩阵。
英文摘要：
The effects of Ca substitutions on the structure, magnetism and electrical properties of YCrO3 ceramics are investigated by X-ray diffraction, magnetic susceptibility and electrical conductivity measurements. The cell volume decrease occurs through the change from Cr(III) to Cr(IV) as a result of the charge compensation of the Ca doping. No changes are observed in the antiferromagnetic transition temperature while strong changes are observed in the transport measurements due to Ca content. The increase of the electrical conductivity as well as the decrease of the activation energy are caused by the formation of the small-polarons localized in the O-Cr-O lattice distortion. The origin of small-polarons in the undoped sample is different in nature from the calcium doped. "Local non-centrosymetry" is the source of the small-polaron formation in undoped sample, while the change from Cr(III) to Cr(IV) through the charge compensation of Ca(II) in the Y(III) site is the source of small-polarons formations. The decrease of the average bond length Cr-O as well as effective moments in the paramagnetic state and the increase of the electrical conductivity are clear evidence that the Ca doping induces localized polarons, which in turn, these quasiparticles move from site to site by a thermally activated process in the doped YCrO3 compound. Here, we also discuss a possible mechanism of small-polaron injections in YCrO3 matrix.
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