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High Pressure Synthesis of New Superconductors and Related Materials

新型超导体及相关材料的高压合成

基本信息

批准号：
EP/G030332/1
负责人：
J Attfield
金额：
$ 72.68万
依托单位：
University of Edinburgh
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FG030332%2F1
关键词：
Pressure Synthesis New Superconductors Related

项目摘要

The discovery of new materials with outstanding properties motivates much of modern chemistry, physics and materials science. Electronic and magnetic materials e.g. superconductors, magnetoresistors, ferroics and multiferroics are a particular challenge due to the unpredictability of the ground states of correlated electron systems, and their frequent sensitivity to small changes in chemical composition and physical conditions. Such inorganic materials tend to have dense, strongly-bonded structures, and so high pressures and temperatures are needed to change their chemical structures and properties. We propose to use pressures up to 25 GPa (250,000 bar) to synthesise new superconductors and other electronic materials:1. A breakthrough in high temperature superconductivity has recently occurred with the discovery that doped rare earth oxypnictides RFeAsO can show critical temperatures surpassed only by the high-Tc cuprates. These materials are clearly the 'next big thing' in superconductivity and will dominate the field over the coming years. We have already demonstrated the utility of our high pressure approach by preparing new superconductors (TbFeAs(O,F), TbFeAsO1-x, DyFeAs(O,F)) with Tc's up to 50 K at high pressure. We propose an investigation of further new RFeAs(O,F) and oxygen-deficient RFeAsO1-x superconductors up to the end of the rare earth series, growth of RFeAs(O,F) crystals, exploration of other chemical substitutions to induce superconductivity, and studies of other families of RMXO and related AM2X2 materials that offer further possibilities of finding new superconductors. 2. Perovskite type transition metal oxides with orbitally-degenerate electronic configurations have many outstanding properties, most famously superconductivity in Cu2+ oxides and CMR colossal magnetoresistances) in Mn3+ oxides. Many new or uncharacterised perovskites can be made at high pressures. We will investigate MnVO3, which unusually has magnetic 3d metals at the A and B sites, possible non-Fermi liquid behaviour in SrIrO3, and the intriguing phase LaRuO3, apparently containing the Ru3+ state which is very rare in oxides.3. New transition metal oxynitrides such as RZrO2N will be investigated - these may show CMR when lightly doped, and magnetic and ferroelectric orders (multiferroism) from R (rare earth) moments and off-centre Zr displacements. We will also explore general new routes for making metal oxynitrides by reacting oxyhalides with Li3N under pressure.4. Bismuth transition metal oxide perovskites e.g. BiMnO3 are important multiferroics - we will explore possible Ruddlesden Popper analogue phases Bi3M2O7 and Bi2MO4 which may be accessible at very high pressures (12-25 GPa). The high pressure form of Bi2CuO4 will also be important for superconductivity.A 1000 tonne press and Walker type synthesis module have recently been set up in Edinburgh as part of the Centre for Science at Extreme Conditions. We will extend the methodology by designing and manufacturing a new sample configuration for very high pressures (up to 25 GPa) and developing crystal growth protocols guided by in situ experiments at ESRF.The structures of the above materials will be determined by X-ray and neutron diffraction, including magnetic neutron scattering to determine potentially unconventional spin structures of RFeAsO for late R elements with large dipolar and quadrupolar moments. Electronic transport and magnetic properties will be measured in CSEC, and further properties will be explored through UK and international collaborations.A 4 year project is needed to allow all of the research to be undertaken by a PDRA (Dr. Rodgers) and by a PhD student who will focus on the new superconductors. Technical and consumables support are also requested to enable a productive high pressure synthesis programme.

具有优异性能的新材料的发现推动了现代化学、物理学和材料科学的发展。电子和磁性材料，如超导体、磁阻器、铁性材料和多铁性材料是一个特别的挑战，因为相关电子系统的基态是不可预测的，而且它们经常对化学成分和物理条件的微小变化敏感。这种无机材料往往具有致密的、强键的结构，因此需要高压和温度来改变它们的化学结构和性能。我们建议使用高达25 Gpa(25万bar)的压力来合成新的超导体和其他电子材料：1.高温超导电性最近取得了突破，发现掺杂稀土氧化物RFeAsO的临界温度只有高T_c铜酸盐才能超过。这些材料显然是超导领域的“下一件大事”，并将在未来几年主导这一领域。我们已经通过在高压下制备T_c高达50K的新型超导体(TbFeAs(O，F)，TbFeAsO_(1-x)，DyFeAs(O，F))证明了高压方法的实用性。我们建议进一步研究新的RFeAs(O，F)和缺氧的RFeAsO1-x超导体，直到稀土系列的结束，RFeAs(O，F)晶体的生长，探索其他化学替代来诱导超导，以及其他家族的RMXO和相关的AM2X2材料的研究，为进一步发现新的超导体提供进一步的可能性。2.具有轨道简并电子组态的钙钛矿型过渡金属氧化物具有许多优异的性质，其中最著名的是Cu2+氧化物的超导电性和Mn3+氧化物的CMR巨磁电阻。许多新的或没有特征的钙钛矿可以在高压下制备。我们将研究MnVO_3，它在A和B位置上异常地具有磁性的3D金属，在SrIrO_3中可能的非费米液体行为，以及有趣的相LaRuO_3，显然包含在氧化物中非常罕见的Ru3+状态。将研究新的过渡金属氧化物氮化物，如RZrO2N，这些化合物在轻掺杂时可能表现出CMR，以及来自R(稀土)矩和偏心Zr位移的磁性和铁电有序(多铁性)。我们还将探索金属氧氮化物与Li3N在加压下反应制备金属氧氮化物的一般新途径。铋过渡金属氧化物钙钛矿(如BiMnO3)是重要的多铁性材料，我们将探索可能的Ruddlesden Popper模拟相Bi3M2O7和Bi2Mo4，它们可能在非常高的压力(12-25 Gpa)下可获得。Bi2CuO4的高压形式对超导性也很重要。爱丁堡最近建立了一个1000吨重的印刷机和沃克型合成模块，作为极端条件下科学中心的一部分。我们将通过设计和制造一种新的高压(高达25 Gpa)的样品构型来扩展方法，并开发在ESRF现场实验指导下的晶体生长协议。上述材料的结构将通过X射线和中子衍射，包括磁中子散射来确定具有大偶极和四极矩的晚期R元素RFeAsO的潜在非传统自旋结构。电子输运和磁性性质将在CSEC中测量，并将通过英国和国际合作探索进一步的性质。需要一个为期4年的项目，以允许所有研究由PDRA(罗杰斯博士)和将专注于新超导体的博士生进行。还要求提供技术和消耗品支持，以实现富有成效的高压合成方案。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer.

DOI：
10.1038/ncomms1361
发表时间：
2011-06-14
期刊：
NATURE COMMUNICATIONS
影响因子：
16.6
作者：
Azuma, Masaki;Chen, Wei-tin;Seki, Hayato;Czapski, Michal;Olga, Smirnova;Oka, Kengo;Mizumaki, Masaichiro;Watanuki, Tetsu;Ishimatsu, Naoki;Kawamura, Naomi;Ishiwata, Shintaro;Tucker, Matthew G.;Shimakawa, Yuichi;Attfield, J. Paul
通讯作者：
Attfield, J. Paul

Competing antiferromagnetic orders in the double perovskite Mn2MnReO6 (Mn3ReO6).