Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe
Qisi Wang,Yao Shen,Bingying Pan,Yiqing Hao,Mingwei Ma,Fang Zhou,P. Steffens,Karin Schmalzl,Thomas Forrest,Mahmoud Abdel-Hafiez,Xiao-Jia Chen,Dmitriy A. Chareev,Alexander N. Vasiliev,Alexander N. Vasiliev,Alexander N. Vasiliev,P. Bourges,Yvan Sidis,Huibo Cao,Jun Zhao +18 more
TLDR
The results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations.Abstract:
In iron-based superconductors the interactions driving the nematic order (that breaks four-fold rotational symmetry in the iron plane) may also mediate the Cooper pairing. The experimental determination of these interactions, which are believed to depend on the orbital or the spin degrees of freedom, is challenging because nematic order occurs at, or slightly above, the ordering temperature of a stripe magnetic phase. Here, we study FeSe (ref. )-which exhibits a nematic (orthorhombic) phase transition at Ts = 90 K without antiferromagnetic ordering-by neutron scattering, finding substantial stripe spin fluctuations coupled with the nematicity that are enhanced abruptly on cooling through Ts. A sharp spin resonance develops in the superconducting state, whose energy (∼4 meV) is consistent with an electron-boson coupling mode revealed by scanning tunnelling spectroscopy. The magnetic spectral weight in FeSe is found to be comparable to that of the iron arsenides. Our results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations.read more
Citations
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High-temperature superconductivity in iron pnictides and chalcogenides
TL;DR: In this article, the authors describe the advances in the field that have led to higher superconducting transition temperatures in iron-based superconductors and the wide range of materials that are used to form these superconductions.
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Solids, liquids, and gases under high pressure
TL;DR: The effect of adding high pressure as a control parameter in solids, liquids, and gases expands opportunities to observe unexpected novel phenomena and understand matter in extreme environments as mentioned in this paper, and a review on high pressure science highlights subjects ranging from quantum criticality to Earth science.
Journal Article
Symmetry breaking orbital anisotropy observed in detwinned Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2}$ above the spin density wave transition
Ming Yi,D. H. Lu,J.-H. Chu,James Analytis,A. P. Sorini,Alexander F. Kemper,Sung-Kwan Mo,Robert G. Moore,Makoto Hashimoto,Wei-Sheng Lee,Zahid Hussain,T. P. Devereaux,Ian R. Fisher,Z.-X. Shen +13 more
TL;DR: In this article, an angle-resolved photoemission spectroscopy study of detwinned single crystals of a representative family of electron-doped iron-arsenide superconductors, Ba(Fe1-xCox)2As2 in the underdoped region was performed.
Journal ArticleDOI
Discovery of orbital-selective Cooper pairing in FeSe
Peter O. Sprau,Peter O. Sprau,Andrey Kostin,Andrey Kostin,Andreas Kreisel,Andreas Kreisel,Anna E. Böhmer,Valentin Taufour,Paul C. Canfield,Paul C. Canfield,Shantanu Mukherjee,Peter Hirschfeld,Brian M. Andersen,J. C. Séamus Davis +13 more
TL;DR: In this paper, the authors used Bogoliubov quasiparticle interference imaging to determine the Fermi surface geometry of the electronic bands surrounding the Γ = (0, 0) and X = (π/ a Fe, 0) points of FeSe and to measure the corresponding superconducting energy gaps.
Journal ArticleDOI
Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
Jianping Sun,Kohei Matsuura,G. Z. Ye,G. Z. Ye,Yuta Mizukami,Masaaki Shimozawa,Kazuyuki Matsubayashi,Minoru Yamashita,Tatsuya Watashige,Shigeru Kasahara,Yuji Matsuda,Jiaqiang Yan,Brian C. Sales,Yoshiya Uwatoko,Jinguang Cheng,Takasada Shibauchi +15 more
TL;DR: High-pressure magnetotransport measurements in FeSe are reported, which uncover the dome shape of magnetic phase superseding the nematic order and highlight unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-Tc cuprates.
References
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Journal ArticleDOI
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TL;DR: The observation of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type α-FeSe compound is reported, indicating that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides.
Journal ArticleDOI
A common thread: The pairing interaction for unconventional superconductors
TL;DR: In this paper, it is proposed that spin-fluctuation mediated pairing is the common thread linking a broad class of superconducting materials, including cuprates, the Fe-pnictides/chalcogenides as well as some heavy fermion and actinide materials.
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Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3
Jian-Feng Ge,Zhi-Long Liu,Canhua Liu,Chun Lei Gao,Dong Qian,Qi-Kun Xue,Ying Liu,Jin-Feng Jia +7 more
TL;DR: FeSe/STO is confirmed as an ideal material for studying high-Tc superconductivity by means of in situ four-point probe electrical transport measurements, and rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperaturesuperconductivity.
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Superconductivity in the iron selenide K x Fe 2 Se 2 (0≤x≤1.0)
Jiangang Guo,Shifeng Jin,Gang Wang,Shunchong Wang,Kaixing Zhu,Tingting Zhou,Meng He,Xiaolong Chen +7 more
TL;DR: In this article, the superconductivity at above 30 K in a FeSe-layer compound K0.8Fe2Se2 (nominal composition) achieved by metal K intercalating in between FeSe layers was reported.