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首页> 外文期刊>Physica, B. Condensed Matter >Structural and magnetic properties of LiMn_(1.5)Fe _(0.5)O_4 spinel oxide
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Structural and magnetic properties of LiMn_(1.5)Fe _(0.5)O_4 spinel oxide

机译：LiMn_（1.5）Fe _（0.5）O_4尖晶石氧化物的结构和磁性

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摘要

Geometrical frustration, which arises from the topology of a well-ordered structure rather than from disorder, has recently become a renewed interest. In particular, geometrical frustration among spins in the spinel oxides can lead to exotic low-temperature states. We reported a joint experimental and theoretical investigation of Fe-doping effect on LiMn_2O_4 spinel oxide in which magnetic moments have geometrical frustration. The structural and physical properties of LiMn_(1.5)Fe_(0.5)O_4 were studied by means of Mossbauer spectroscopy, X-ray diffraction, scanning electron microscope (SEM), electrical and magnetic measurements. Electronic conductivity measurements showed that Verwey-type transition is absent in heavily Fe-doped LiMn_2O_4. In addition, LiMn_(1.5)Fe _(0.5)O_4 exhibits a semiconductor characteristic in resistivity with an energy gap E_g=0.27 eV, which is consistent with our first-principle simulation. A large resistivity at room temperature for LiMn_(1.5)Fe_(0.5)O_4 indicates low concentration of conduction electrons corresponding to electronic localization behavior. X-ray diffraction refinement as well as Mossbauer analysis suggests that Fe ions preferentially substitute for Mn ions on the octahedral B-sites. Moreover, small amount of Fe replace for Li ions to form a site inversion in spinel structure. In contrast to the pure and low-Fe-doped LiMn_2O_4 samples, LiMn_(1.5)Fe_(0.5)O_4 has an antiferromagnetic transition at T_N=34 K. The Fe dopants enhance the antiferromagnetic interaction among moments accompanied by breaking the original moment equilibrium and suppressing the magnetic frustration in LiMn_2O _4.
机译：几何上的挫伤是由井井有条的结构的拓扑而不是由无序引起的，最近引起了人们的新兴趣。特别地，尖晶石氧化物中的自旋之间的几何受挫会导致奇特的低温状态。我们报道了Fe掺杂对LiMn_2O_4尖晶石氧化物的联合实验和理论研究，其中磁矩具有几何失灵。通过Mossbauer光谱，X射线衍射，扫描电子显微镜（SEM），电学和磁学测量研究了LiMn_（1.5）Fe_（0.5）O_4的结构和物理性能。电子电导率测量表明，在高铁掺杂的LiMn_2O_4中不存在Verwey型跃迁。此外，LiMn_（1.5）Fe _（0.5）O_4表现出电阻率的半导体特性，其能隙E_g = 0.27 eV，这与我们的第一性原理模拟一致。 LiMn_（1.5）Fe_（0.5）O_4在室温下的大电阻率表示与电子局域行为相对应的低浓度导电电子。 X射线衍射细化以及Mossbauer分析表明，Fe离子优先替代八面体B位上的Mn离子。而且，少量的Fe代替Li离子形成尖晶石结构的位点反转。与纯的和低掺杂的LiMn_2O_4样品相反，LiMn_（1.5）Fe_（0.5）O_4在T_N = 34 K时具有反铁磁跃迁。Fe掺杂剂增强了矩之间的反铁磁相互作用，同时破坏了原始矩平衡，并且抑制了LiMn_2O _4中的磁阻。

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