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Nanostructure physics in copper oxides-the relation with unconventional properties of high-temperature superconductors and application of new properties

铜氧化物纳米结构物理——与高温超导体非常规性能的关系及新性能的应用

基本信息

批准号：
15510093
负责人：
ZHENG Xu-guang
金额：
$ 2.5万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Main results :1.We doped holes into the simplest copper oxide of CuO. We have found that the suppression of antiferromagnetism in CuO is dramatically rapid. Moreover, charge-stripe-like order has been observed. We have also obtained evidences of the separation of magnetic phase which suggests charge-stripe-associated spin order from μSR study. We therefore clarified that the charge-stripe, which is considered a key property for the high-temperature superconductors, develops in the simplest compound of CuO.2.We prepared nanoparticles of CuO and investigated the change in magnetism. We have found that the magnetic transition temperature in nanoparticle CuO is drastically reduced, demonstrating a dramatic finite-size effect. This is the first report of direct evidence of a drastic decrease of the magnetic transition temperature in antiferromagnetic system.3.We have found spin-glass properties in natural cuprates of Cu_2Cl(OH)_3. Furthermore, we have found that it is a new geometrically frustrated system with d-electron spins. We found the co-existence of spin fluctuation and magnetic order. This discovery uncovers a new route for the study of geometric frustration both in the material aspect as well as in the magnetism (of d-electron spins). As a material route, it provides a new system of M_2X(OH)_3 with a huge number where M is transition metal and X halogen.These discoveries are partly reflected in 15 papers published or accepted for publication in scientific magazines such as Physical Review Letters.

主要结果如下：1.在最简单的氧化铜CuO中掺杂空穴。我们已经发现，反铁磁性的抑制在氧化铜是显着迅速。此外，还观察到了类似电荷条纹的有序性。我们还从μSR研究中获得了磁相分离的证据，这表明了与电荷条纹相关的自旋有序。因此，我们澄清了电荷条纹，这被认为是高温超导体的关键属性，在最简单的化合物CuO中发展。2.我们制备了CuO纳米颗粒，并研究了磁性的变化。我们已经发现，纳米CuO的磁转变温度大幅降低，表现出戏剧性的有限尺寸效应。这是第一个直接证明反铁磁系统的磁转变温度急剧下降的报告。3.我们在天然铜氧化物Cu_2Cl（OH）_3中发现了自旋玻璃性质。此外，我们还发现它是一个新的具有d电子自旋的几何阻挫系统。我们发现自旋涨落和磁序同时存在。这一发现揭示了一个新的路线，无论是在材料方面，以及在磁性（d-电子自旋）的几何挫折的研究。作为一条物质路线，它提供了一个新的M_2X（OH）_3体系，其中M是过渡金属，X是卤素，这些发现部分反映在15篇发表或接受发表在《物理评论快报》等科学杂志上的论文中。