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.

具有出色特性的新材料的发现激发了现代化学，物理和材料科学的大部分。电子和磁性材料，例如由于相关电子系统的基态不可预测性以及它们对化学组成和物理条件的较小变化的敏感性，因此超导体，磁路线，铁素体和多表情是一个特别的挑战。这种无机材料倾向于具有密集，固定的结构，因此需要高压力和温度来改变其化学结构和特性。我们建议使用最多25 GPA（250,000 bar）的压力来合成新的超导体和其他电子材料：1。最近发现，掺杂的稀土氧化剂rfeaso的发现最近发生了高温超导性的突破，只能显示出仅高-TC酸辣椒才能显示出的临界温度。这些材料显然是超导性的“下一个大事”，并且将在未来几年中占主导地位。我们已经通过准备新的超压力导体（TBFEAS（O，F），TBFEASO1-X，DYFEAS（O，F））来证明高压进近方法的实用性，而TC在高压下高达50 K。我们提出了对稀土系列的末端，rfeas（O，F）晶体的生长，探索其他化学替代的探索超导性，诱导超导性的，对进一步的新rfeas（O，f）和缺氧的RFEASO1-X超导体进行调查以及对其他RMXO及相关AM2X2材料的研究，这些材料提供了寻找新超导体的进一步可能性。 2。具有轨道脱位电子构型具有许多出色的特性，在Cu2+氧化物中最著名的超导性和CMR巨大的磁磁性含量具有许多出色的超导性）。许多新的或未表征的钙棍可以在高压下进行。我们将研究MNVO3，该MNVO3在A和B位点具有异常具有磁性3D金属，SRIRO3中可能的非Fermi液体行为以及有趣的相位LaruO3，显然包含RU3+状态，在氧化物中很少见。3。将研究新的过渡金属氧气（例如RZRO2N） - 这些可能显示出轻度掺杂时的CMR，R（稀土）矩和中心ZR位移的磁性和铁电阶（多性效应）。我们还将通过在压力下与LI3N反应氧气来探索一般的新途径，以制造金属氧气。4。 Bismuth过渡金属氧化金属钙钛矿，例如BIMNO3是重要的多效应 - 我们将探索可能在很高的压力（12-25 GPA）下可访问的Ruddlesden Popper模拟阶段BI3M2O7和BI2MO4。 BI2CUO4的高压形式对于超导性也很重要。A1000吨新闻和Walker型合成模块最近在Edinburgh建立了在极端条件下作为科学中心的一部分。我们将通过设计和制造针对非常高的压力（最多25 GPA）的新样品配置并制定由ESRF的原位实验指导的晶体生长方案来扩展方法。上述材料的结构将由X射线和中子衍射，包括磁性中子散射，以确定rfeaso的潜在不合常规自旋结构，用于具有较大偶极和四极矩的晚R元素。电子传输和磁性特性将在CSEC中进行测量，并将通过英国和国际合作探索进一步的特性。需要4年的项目以允许PDRA（Rodgers博士）进行所有研究，并通过博士学位进行。将专注于新超导体的学生。还请求技术和消耗品支持以实现高压合成计划。

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).