Nanoscale phase separation in colossal magnetoresistance materials: lessons for the cuprates?
Nanoscale phase separation in colossal magnetoresistance materials: lessons for the cuprates?
复制标题
DOI：
10.1016/s0038-1098(02)00662-2
复制
发表时间：
2003-03-01
影响因子：
2.1
通讯作者：
Moreo, A
中科院分区：
文献类型：
--
作者：
Dagotto, E;Burgy, J;Moreo, A
最近对锰矿石进行的大量实验和理论研究表明，可以根据电荷有序相和铁磁相的竞争来理解巨大的磁阻效应。理论描述的一般方面似乎对任何具有本征相竞争的化合物都是有效的。在高温超导体中，最近的实验表明，在许多材料中存在固有的不均匀性，揭示了与锰氧化物非常相似的现象。这里，简要回顾了锰矿石的研究结果，重点是一般方面。此外，理论推测是在铜氧化物的背景下制定的，仅仅通过类比与锰矿石。这包括对自旋玻璃体制作为反铁磁和超导岛的混合物的初步解释，将赝隙温度T-*合理化为冷却后簇开始形成的格里菲斯温度，铜酸盐中“巨大”效应的预测，以及对cu氧化物中淬火无序可能比先前预期的更相关的观察。2003爱思唯尔科学有限公司版权所有。
A recent vast experimental and theoretical effort in manganites has shown that the colossal magnetoresistance effect can be understood based on the competition of charge-ordered and ferromagnetic phases. The general aspects of the theoretical description appear to be valid for any compound with intrinsic phase competition. In high temperature superconductors, recent experiments have shown the existence of intrinsic inhomogeneities in many materials, revealing a phenomenology quite similar to that of manganese oxides. Here, the results for manganites are briefly reviewed with emphasis on the general aspects. In addition, theoretical speculations are formulated in the context of Cu-oxides by mere analogy with manganites. This includes a tentative explanation of the spin-glass regime as a mixture of antiferromagnetic and superconducting islands, the rationalization of the pseudogap temperature T-* as a Griffiths temperature where clusters start forming upon cooling, the prediction of 'colossal' effects in cuprates, and the observation that quenched disorder may be far more relevant in Cu-oxides than previously anticipated. (C) 2003 Elsevier Science Ltd. All rights reserved.