Anomalously large anisotropic magnetoresistance in a perovskite manganite
Anomalously large anisotropic magnetoresistance in a perovskite manganite
复制标题
钙钛矿锰酸盐中异常大的各向异性磁阻
DOI：
10.1073/pnas.0907618106
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发表时间：
2009-08-25
影响因子：
11.1
通讯作者：
Zhang, Jiandi
中科院分区：
文献类型：
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作者：
Li, Run-Wei;Wang, Huabing;Zhang, Jiandi
相关电子材料的特征是自旋、电荷、轨道和晶格之间的耦合，从而产生奇异的功能。这种复杂性直接导致了它们的可调性。在这里，我们证明了对称性破缺，通过立方晶系的正交畸变的晶格结构中的原型锰氧化物单晶，La0.69Ca0.31MnO3，导致各向异性的磁弹性响应的外部场，并因此显着的磁输运行为。反常的各向异性磁电阻（AMR）效应发生在系统中的金属-绝缘体转变（MIT）附近，显示出与系统中的各向异性场调谐MIT直接相关，并且可以通过简单的唯象模型来理解。一个小的晶体各向异性刺激一个“missal”AMR附近的MIT相边界的系统，从而揭示了密切的相互作用之间的磁和电子-晶体耦合。
The signature of correlated electron materials (CEMs) is the coupling between spin, charge, orbital and lattice resulting in exotic functionality. This complexity is directly responsible for their tunability. We demonstrate here that the broken symmetry, through cubic to orthorhombic distortion in the lattice structure in a prototype manganite single crystal, La0.69Ca0.31MnO3, leads to an anisotropic magneto-elastic response to an external field, and consequently to remarkable magneto-transport behavior. An anomalous anisotropic magnetoresistance (AMR) effect occurs close to the metal-insulator transition (MIT) in the system, showing a direct correlation with the anisotropic field-tuned MIT in the system and can be understood by means of a simple phenomenological model. A small crystalline anisotropy stimulates a "colossal'' AMR near the MIT phase boundary of the system, thus revealing the intimate interplay between magneto-and electroniccrystalline couplings.