NDLI: Identifying the genes of unconventional high temperature superconductors

Content Provider	Springer Nature Link
Author	Hu, Jiangping
Copyright Year	2016
Abstract	We elucidate a recently emergent framework in unifying the two families of high temperature (high $$T_{\rm c}$$ ) superconductors, cuprates and iron-based superconductors. The unification suggests that the latter is simply the counterpart of the former to realize robust extended s-wave pairing symmetries in a square lattice. The unification identifies that the key ingredients (gene) of high $$T_{\rm c}$$ superconductors is a quasi two dimensional electronic environment in which the d-orbitals of cations that participate in strong in-plane couplings to the p-orbitals of anions are isolated near Fermi energy. With this gene, the superexchange magnetic interactions mediated by anions could maximize their contributions to superconductivity. Creating the gene requires special arrangements between local electronic structures and crystal lattice structures. The speciality explains why high $$T_{\rm c}$$ superconductors are so rare. An explicit prediction is made to realize high $$T_{\rm c}$$ superconductivity in Co/Ni-based materials with a quasi two dimensional hexagonal lattice structure formed by trigonal bipyramidal complexes.八年前铁基超导体的偶然发现带来了高温超导新–轮研究高潮的同时,也不得不让我们深刻地反思过去近三十年铜基高温超导的研究的问题:为什么过去的研究没有对铁基超导体发现提供任何有意义的线索?究竟是什么特性使得它们独立于其他材料成为高温超导体?本文基于对两者的超导配对对称性统–理解出发提出两者的配对机理都来自反铁磁超交换相互作用并且指出两者都拥有支持该机理的独特电子结构–在费米能量附近,参与强反铁磁超交换相互作用的电子轨道独立存在.这种独特电子结构可以被认为是高温超导的基因.它们的形成是由构造材料的基本配位单元,材料整体晶格结构以及轨道上的电子数三者共同配合决定的.本文预言这种基因还可以在由三角双锥配位单元组合的二维六方晶格中当d 轨道上有7 个电子(Co$^{2+}$/Ni$^{3+}$) 附近实现,并且会支持d+id 的超导配对。因此合成这种结构的材料会可能对非常规高温超导机理有决定性的影响。
Starting Page	561
Ending Page	569
Page Count	9
File Format	PDF
ISSN	20959273
Journal	Chinese Science Bulletin
Volume Number	61
Issue Number	7
e-ISSN	20959281
Language	English
Publisher	Science China Press
Publisher Date	2016-03-14
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cuprates Iron-based superconductors Unconventional high T $_{c}$ superconducotors Superexchange Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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