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Identifying the genes of unconventional high temperature superconductors 被引量:5

Identifying the genes of unconventional high temperature superconductors
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摘要 We elucidate a recently emergent framework in unifying the two families of high temperature (high To) 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 Tc superconductors is a quasi two dimensional electronic environment in which the d-orbitals of cations that partic- ipate 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 Tc superconductors are so rare. An explicit prediction is made to realize high Tc superconductivity in Co/Ni-based materials with a quasi two dimensional hexagonal lattice structure formed by trigonal bipyramidal complexes. We elucidate a recently emergent framework in unifying the two families of high temperature(high T_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_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_c superconductors are so rare. An explicit prediction is made to realize high T_c superconductivity in Co/Ni-based materials with a quasi two dimensional hexagonal lattice structure formed by trigonal bipyramidal complexes.
作者 Jiangping Hu
出处 《Science Bulletin》 SCIE EI CAS CSCD 2016年第7期561-569,共9页 科学通报(英文版)
基金 supported by the National Basic Research Program of China National Natural Science Foundation of China the Strategic Priority Research Program of Chinese Academy of Sciences
关键词 CUPRATES Iron-based superconductors Unconventional high Tc superconducotors SUPEREXCHANGE 高温超导体 基因鉴定 晶格结构 磁相互作用 电子环境 费米能级 超导电性 电子结构
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