Superconducting Gap Structure and Symmetry in Fe Based Superconductors
铁基超导体中的超导能隙结构和对称性
基本信息
- 批准号:EP/H040048/1
- 负责人:
- 金额:$ 46.37万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2010
- 资助国家:英国
- 起止时间:2010 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This is a proposal about exploration of a new exciting family of superconducting material systems. The work described here is strategically important in the UK and internationally. It places the Imperial group at the heart of these new developments. This proposal aims to enhance understanding, of the newly-discovered Fe based superconductor materials, in particular to unravel the superconducting gap structure and symmetry and its relationship to doping and crystal structure. In the eighteen months since high Tc pnictide materials were discovered, the area has become fundamentally extremely rich. Many families of material have been discovered, the similarities and differences to high Tc cuprates superconductors have become clearer. Most importantly high quality pnictide crystals have now become readily available. We plan to utilise the specialised facilities and expertise available to us to make a high impact investigation of the fundamental and applied properties of these systems, exploiting our excellent collaborative links to the best international crystal growing groups around the world. Serendipity has played a major role in the discovery of new superconductors since 1986 - an indication of the difficulty we have in predicting the behaviour of relatively simple inorganic compounds, despite the development of powerful analytical tools for electronic structure. Indeed, only for the simplest binary compound, MgB2, is there is a consensus on the understanding of the superconducting mechanism, and even there it has proved impossible to engineer the phase so as to further enhance the superconducting transition temperature Tc to any significant degree. One reason for MgB2 being such a difficult compound to improve is the paucity of other phases sufficiently similar in structure and chemistry to allow tuning of its properties. In contrast, in the eighteen months since the initial discovery of oxypnictide superconductivity, several different - but closely related - families of compounds have emerged. Consequently, there is a much larger chemical parameter space to be explored, within which it should be possible to gain a much improved understanding of the role of magnetic order in competing with superconductivity. On the other hand, in comparison with the cuprate superconductors, the latter have so many structure types and are often so difficult to prepare with high quality, that their complexity is a serious impediment to understanding. To give one example, the cuprate superconductor that has been most intensively commercialised to date, the BaSrCaCuO 2223 phase, has never yet been grown as a sizeable high-quality single crystal for fundamental studies.We suggest therefore that a continued exploration of the oxypnictide families is likely to improve our understanding of electronic properties of materials at a rapid pace, and perhaps even to improve our predictive abilities. This grant will build on our substantial preliminary investigations using Andreev point contact spectroscopy, that have been conducted on polycrystalline materials. This work gives us confidence in our methodology and our planned future activities. With access to high quality single crystals that are now readily available, we believe that we will be able to make significant possibly step change impact in this field both in terms of gap structure and symmetry and in terms of the role of phonons in the superconducting mechanism.
这是一个关于探索一个新的超导材料体系的计划。这里描述的工作在英国和国际上具有重要的战略意义。它将帝国集团置于这些新发展的核心。该提案旨在加强对新发现的铁基超导材料的理解,特别是解开超导能隙结构和对称性及其与掺杂和晶体结构的关系。在发现高Tc磷属元素化物材料后的18个月里,该地区基本上变得非常丰富。许多系列的材料被发现,与高Tc铜酸盐超导体的相似性和差异性变得更加清晰。最重要的是,高质量磷属元素化物晶体现在已经变得容易获得。我们计划利用我们现有的专业设施和专业知识,对这些系统的基本和应用特性进行高影响力的研究,利用我们与世界各地最好的国际晶体生长集团的良好合作关系。自1986年以来,偶然性在新超导体的发现中发挥了重要作用-这表明我们在预测相对简单的无机化合物的行为时遇到了困难,尽管电子结构的强大分析工具已经开发出来。事实上,只有对于最简单的二元化合物MgB 2,人们对超导机制的理解是一致的,即使在那里,也已经证明不可能设计相以进一步提高超导转变温度Tc到任何显着的程度。MgB 2是如此难以改进的化合物的一个原因是缺乏在结构和化学上足够相似以允许调节其性质的其他相。相比之下,在最初发现氧氮族化合物超导性后的18个月里,出现了几种不同但密切相关的化合物家族。因此,有一个更大的化学参数空间需要探索,在这个空间内,应该可以更好地理解磁序在与超导性竞争中的作用。另一方面,与铜酸盐超导体相比,后者具有如此多的结构类型,并且通常难以制备高质量,以至于它们的复杂性严重阻碍了理解。举一个例子,铜酸盐超导体,已被最密集的商业化的日期,BaSrCaCuO 2223相,还没有被生长为一个相当大的高质量的单晶的基础studies.We建议,因此,继续探索oxypnictide家庭可能会提高我们的理解材料的电子性质在一个快速的步伐,甚至可能提高我们的预测能力。这项资助将建立在我们使用Andreev点接触光谱进行的大量初步研究的基础上,这些研究已经在多晶材料上进行。这项工作使我们对我们的方法和我们计划的未来活动充满信心。随着高质量单晶的获得,我们相信,我们将能够在这一领域做出重大的可能的阶跃变化影响,无论是在间隙结构和对称性方面,还是在超导机制中声子的作用方面。
项目成果
期刊论文数量(9)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Magnetotransport of proton-irradiated BaFe 2 As 2 and BaFe 1.985 Co 0.015 As 2 single crystals
质子辐照的BaFe 2 As 2 和BaFe 1.985 Co 0.015 As 2 单晶的磁输运
- DOI:10.1103/physrevb.91.054512
- 发表时间:2015
- 期刊:
- 影响因子:3.7
- 作者:Moseley D
- 通讯作者:Moseley D
Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor
质子辐照对欠掺杂Ba(Fe0.96Co0.04)2As2磷族超导体通量钉扎性能的影响
- DOI:10.1016/j.jallcom.2016.10.103
- 发表时间:2017
- 期刊:
- 影响因子:6.2
- 作者:Salem-Sugui S
- 通讯作者:Salem-Sugui S
Andreev spectroscopy of CrO 2 thin films on TiO 2 and Al 2 O 3
TiO 2 和 Al 2 O 3 上的 CrO 2 薄膜的 Andreev 光谱
- DOI:10.1209/0295-5075/103/67005
- 发表时间:2013
- 期刊:
- 影响因子:0
- 作者:Yates K
- 通讯作者:Yates K
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Lesley Cohen其他文献
Spin Pumping Long-Range Spin-Triplet Currents into Superconducting Nb Through Cr/Fe Interfaces
通过 Cr/Fe 界面将长程自旋三线态电流自旋泵入超导 Nb
- DOI:
- 发表时间:
2022 - 期刊:
- 影响因子:0
- 作者:
Alex K. Chan;Murat Cubukcu;Sachio Komori;Alexander Vanstone;Juliet Thompson;Garry Perkins;Mark Blamire;Jason Robinson;Matthias Eschrig;Hidekazu Kurebayashi;Lesley Cohen - 通讯作者:
Lesley Cohen
The role of competing magnetic interactions on the abnormal expansion properties in manganese antiperovskites, Mn 3+ x A 1 (cid:0) x N ( A = Ni, Sn)
- DOI:
- 发表时间:
2020 - 期刊:
- 影响因子:0
- 作者:
Lesley Cohen - 通讯作者:
Lesley Cohen
Doing philosophy is doing its history
- DOI:
10.1007/bf00485509 - 发表时间:
1986-04-01 - 期刊:
- 影响因子:1.300
- 作者:
Lesley Cohen - 通讯作者:
Lesley Cohen
Lesley Cohen的其他文献
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{{ truncateString('Lesley Cohen', 18)}}的其他基金
ULTRA-HIGH-RESOLUTION, ULTRA-SENSITIVE MULTIFUNCTIONAL BALLISTIC NANO SENSORS FOR THE SIMULTANEOUS DETECTION OF MAGNETIC, ELECTRIC AND OPTICAL FIELDS
用于同时检测磁场、电场和光学场的超高分辨率、超灵敏多功能弹道纳米传感器
- 批准号:
EP/J014699/1 - 财政年份:2012
- 资助金额:
$ 46.37万 - 项目类别:
Research Grant
Doctoral Training Grant (DTG) to provide funding for 2 PhD studentships
博士培训补助金 (DTG) 为 2 名博士生提供资助
- 批准号:
NE/I527937/1 - 财政年份:2010
- 资助金额:
$ 46.37万 - 项目类别:
Training Grant
Doctoral Training Grant (DTG) to provide funding for 2 PhD Studentships
博士培训补助金 (DTG) 为 2 名博士生提供资助
- 批准号:
NE/H524749/1 - 财政年份:2009
- 资助金额:
$ 46.37万 - 项目类别:
Training Grant
EXTRAORDINARY MAGNETORESISTANCE NANO SENSORS - FUNDAMENTAL ISSUES AND APPLICATIONS
非凡的磁阻纳米传感器 - 基本问题和应用
- 批准号:
EP/F065922/1 - 财政年份:2008
- 资助金额:
$ 46.37万 - 项目类别:
Research Grant
Inhomogeneous magnetism and superconductivity
非均匀磁性和超导性
- 批准号:
EP/F016271/1 - 财政年份:2008
- 资助金额:
$ 46.37万 - 项目类别:
Research Grant
A Platform to Develop and Utilise Characterisation Tools for Functional Magnetic Materials
开发和利用功能磁性材料表征工具的平台
- 批准号:
EP/E016243/1 - 财政年份:2007
- 资助金额:
$ 46.37万 - 项目类别:
Research Grant
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