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Crystal chemistry and structural design of iron-based superconductors

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Chinese Physics B 2013年第8期22卷 135-145页

作者：蒋好孙云蕾许祝安曹光旱 Department of Physics Zhejiang University Hangzhou 310027 China

The second class of high-temperature superconductors （HTSCs）, iron-based pnictides and chalcogenides, necessarily contain Fe2X2 （＂X＂ refers to a pnictogen or a chalcogen element） layers, just like the first class of HTSCs which possess the essential CuO2 sheets. So far, dozens of iron-based HTSCs, classified into nine groups, have been discovered. In this article, the crystal-chemistry aspects of the known iron-based superconductors are reviewed and summarized by employing ＂hard and soft acids and bases （HSAB）＂ concept. based on these understandings, we propose an alternative route to exploring new iron-based superconductors via rational structural design.

关键词： iron-based superconductors crystal chemistry structural design

Spin, charge, and orbital orderings in iron-based superconductors

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Chinese Physics B 2013年第8期22卷 75-81页

作者：江庆康耀太姚道新 State Key Laboratory of Optoelectronic Materials and Technology School of Physics and Engineering Sun Yat-Sen University

In this article, we briefly review spin, charge, and orbital orderings in iron-based superconductors, as well as the multi-orbital models. The interplay of spin, charge, and orbital orderings is a key to understand the high temperature superconductivity. As an illustration, we use the two-orbital model to show the spin and charge orderings in iron-based superconductors based on the mean-field approximation in real space. The typical spin and charge orderings are shown by choosing appropriate parameters, which are in good agreement with experiments. We also show the effect of Fe vacancies, which can introduce the nematic phase and interesting magnetic ground states. The orbital ordering is also discussed in iron-based superconductors. It is found that disorder may play a role to produce the superconductivity.

关键词： iron-based superconductors multi-orbital models magnetic ordering charge stripe

Review of nuclear magnetic resonance studies on iron-based superconductors

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Chinese Physics B 2013年第8期22卷 181-197页

作者：马龙于伟强 Department of Physics Renmin University of China

The newly discovered iron-based superconductors have triggered renewed enormous research interest in the condensed matter physics community. Nuclear magnetic resonance （NMR） is a low-energy local probe for studying strongly correlated electrons, and particularly important for high-Tc superconductors. In this paper, we review NMR studies on the structural transition, antiferromagnetic order, spin fluctuations, and superconducting properties of several iron-based high-Tc superconductors, including LaFeAsOl_xFx, LaFeAsOl_x, BaFe2As2, Bal_xKxFe2As2, Cao.23Nao.67Fe2As2, BaFe2（Asl_xPx）2, Ba（Fel_xRux）2As2, Ba（Fel_xCox）2As2, Lil＋xFeAs, LiFel_xCoxAs, NaFeAs, NaFel_xCoxAs, KyFe2_xSe2, and （T1,Rb）yFe2_xSe2.

关键词： iron-based superconductors nuclear magnetic resonance (NMR) spin fluctuation superconduc-tivity

Angle-resolved photoemission spectroscopy study on iron-based superconductors

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Chinese Physics B 2013年第8期22卷 109-122页

作者：叶子荣张焱谢斌平封东来 State Key Laboratory of Surface Physics Department of Physics and Advanced Materials Laboratory Fudan University

Angle-resolved photoemission spectroscopy （ARPES） has played an important role in determining the band structure and the superconducting gap structure of iron-based superconductors. In this paper, from the ARPES perspective, we briefly review the main results from our group in recent years on the iron-based superconductors and their parent compounds, and depict our current understanding on the antiferromagnetism and superconductivity in these materials.

关键词： iron-based superconductors angle-resolved photoemission spectroscopy electronic structure

Protonation induced high-T_c phases in iron-based superconductors evidenced by NMR and magnetization measurements

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Science Bulletin 2018年第1期63卷 11-16页

作者： Yi Cui Gehui Zhang Haobo Li Hai Lin Xiyu Zhu Hai-Hu Wen Guoqing Wang Jinzhao Sun Mingwei Ma Yuan Li Dongliang Gong Tao Xie Yanhong Gu Shiliang Lie Huiqian Luo Pu Yu Weiqiang Yu Department of Physics Renmin University of China Beijing 100872 China State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center for Advanced Microstructures Nanjing University Nanjing 210093 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sdences Beijing 100049 China

Chemical substitution during growth is a well-established method to manipulate electronic states of quantum materials, and leads to rich spectra of phase diagrams in cuprate and iron-based superconductors. Here we report a novel and generic strategy to achieve nonvolatile electron doping in series of(i.e.11 and 122 structures) Fe-based superconductors by ionic liquid gating induced protonation at room temperature. Accumulation of protons in bulk compounds induces superconductivity in the parent compounds, and enhances the Tclargely in some superconducting ones. Furthermore, the existence of proton in the lattice enables the first proton nuclear magnetic resonance(NMR) study to probe directly superconductivity. Using Fe S as a model system, our NMR study reveals an emergent high-Tcphase with no coherence peak which is hard to measure by NMR with other isotopes. This novel electric-fieldinduced proton evolution opens up an avenue for manipulation of competing electronic states(*** insulators), and may provide an innovative way for a broad perspective of NMR measurements with greatly enhanced detecting resolution.

关键词： Ion liquid gating Protonation NMR iron-based superconductors

Universal behavior of the upper critical field in iron-based superconductors

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Frontiers of physics 2011年第4期6卷 463-473页

作者： Jing-lei Zhang Lin Jiao Ye Chen Hui-qiu Yuan Department of Physics Zhejiang University Hangzhou 310027 China

The newly discovered iron-based high temperature superconductors have demonstrated rich phys- ical properties. Here we give a brief review on the recent studies of the upper critical field and its anisotropy in a few typical series of the iron-based superconductors （FeSCs）. In spite of their characters of a layered crystal structure, all the FeSCs possess an extremely large upper critical field and a weak anisotropy of superconductivity, being unique among the layered superconductors. These particular properties indicate potential applications of the FeSCs in the future. based on the experimental facts of the FeSCs, we will discuss the possible mechanisms of pair breaking in high magnetic fields and its restrictions on the theoretical analysis of the superconducting pairing mechanisms.

关键词： iron-based superconductors upper critical field high magnetic field

Robustness of s-wave pairing symmetry in iron-based superconductors and its implications for fundamentals of magnetically driven high-temperature superconductivity

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Frontiers of physics 2016年第5期11卷 79-89页

作者： Jiangping Hu Jing Yuan Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics Purdue University West Lafayette IN 47907 USA Collaborative Innovation Center of Quantum Matter Beijing 100871 China

based on the assumption that the superconducting state belongs to a single irreducible representation of lattice symmetry, we propose that the pairing symmetry in all measured iron-based superconductors is generally consistent with the A1g s-wave. Robust s-wave pairing throughout the different families of iron-based superconductors at different doping regions signals two fundamental principles behind high-To superconducting mechanisms：（i） the correspondence principle： the short-range magnetic-exchange interactions and the Fermi surfaces act collaboratively to achieve high-Tc superconductivity and determine pairing symmetries; （ii） the magnetic-selection pairing rule： supercon- ductivity is only induced by the magnetic-exchange couplings from the super-exchange mechanism through cation-anion-cation chemical bonding. These principles explain why unconventional high- Tc superconductivity appears to be such a rare but robust phenomena, with its strict requirements regarding the electronic environment. The results will help us to identify new electronic structures that can support high-Tc superconductivity.

关键词： iron-based superconductors cuprates unconventional superconductivity high-temperature superconductors

A reflection on the contrast between the Cooper pairing in iron-based and conventional superconductors

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Frontiers of physics 2011年第4期6卷 350-356页

作者： Fa Wang Dung-Hal Lee Department of Physics Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Physics University of California at Berkeley Berkeley CA 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

In this Perspective article we review retrospectively the streamline of our work on iron-based superconductors, and reflect on the mechanism of Cooper pairing in conventional and unconventional, such as iron-based sup... 详细信息

关键词： Cooper pairing iron-based superconductors effective interaction renormalizationgroup

iron-based high transition temperature superconductors

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National Science Review 2014年第3期1卷 371-395页

作者： Xianhui Chen Pengcheng Dai Donglai Feng Tao Xiang Fu-Chun Zhang Department of Physics University of Science and Technology of China Department of Physics and Astronomy Rice University Institute of Physics Chinese Academy of Sciences Department of Physics Fudan University Collaborative Innovation Center of Quantum Matter Department of Physics Zhejiang University

In a superconductor electrons form pairs and electric transport becomes dissipation-less at low temperatures. Recently discovered iron-based superconductors have the highest superconducting transition temperature next to copper oxides. In this article, we review material aspects and physical properties of iron-based superconductors. We discuss the dependence of transition temperature on the crystal structure,the interplay between antiferromagnetism and superconductivity by examining neutron scatering experiments, and the electronic properties of these compounds obtained by angle-resolved photoemission spectroscopy in link with some results from scanning tunneling microscopy/spectroscopy *** microscopic model for this class of compounds is discussed from a strong coupling point of view.

关键词： superconductivity angle-resolved photoemission spectroscopy iron-based superconductors