Journal Article10.1103/physrevmaterials.6.064803
Post-growth Fe deposition on the superconductivity of monolayer FeSe films on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>SrTi</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msu
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TL;DR: In this paper , the superconductivity in bulk FeSe depends sensitively on the stoichiometry, ditto for the monolayer FeSe films grown on other substrates.
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Abstract: The superconductivity in bulk FeSe depends sensitively on the stoichiometry, ditto for the monolayer FeSe films grown on $\mathrm{SrTi}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ and other substrates. To tune the stoichiometry, we deposit Fe onto monolayer FeSe films after epitaxial growth. Using in situ low-temperature scanning tunneling microscopy/spectroscopy, we find that the postdeposited Fe atoms incorporate into monolayer films and combine with excess Se to form FeSe, with an upper coverage limit of \ensuremath{\sim}0.4 unit-cell. Consequently, the superconducting gap concentrates in 10 to 12 meV. The work demonstrates a simple method for stoichiometry tuning and improving the spatial uniformity of monolayer FeSe films. Compared with the gap of \ensuremath{\sim}15 to 20 meV for the annealed films, the smaller superconducting gap indicates weakened FeSe-${\mathrm{TiO}}_{2}$ coupling due to interfacial Se atom substitution.
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Citations
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Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3
Qingyan Wang,Qingyan Wang,Zhi Li,Wenhao Zhang,Zuocheng Zhang,Jinsong Zhang,Wei Li,Hao Ding,Yunbo Ou,Peng Deng,Kai Chang,Jing Wen,Can-Li Song,Ke He,Jin-Feng Jia,Shuai-Hua Ji,Yayu Wang,Lili Wang,Xi Chen,Xucun Ma,Qi-Kun Xue +20 more
TL;DR: In this paper, the authors reported high transition temperature superconductivity in one unitcell (UC) thick FeSe films grown on a Se-etched SrTiO3 (001) substrate by molecular beam epitaxy (MBE).
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Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
Shaolong He,Junfeng He,Wenhao Zhang,Wenhao Zhang,Lin Zhao,Defa Liu,Xu Liu,Daixiang Mou,Yunbo Ou,Qingyan Wang,Qingyan Wang,Zhi Li,Lili Wang,Yingying Peng,Yan Liu,Chaoyu Chen,Li Yu,Guodong Liu,Xiaoli Dong,Jun Zhang,Chuangtian Chen,Zuyan Xu,Xi Chen,Xucun Ma,Qi-Kun Xue,Xingjiang Zhou +25 more
TL;DR: The phase diagram for an FeSe monolayer grown on a SrTiO3 substrate is reported, by tuning the charge carrier concentration over a wide range through an extensive annealing procedure, and strong indications of superconductivity are observed with a transition temperature of 65±5 K.
Interfacial mode coupling as the origin of the enhancement of T(c) in FeSe films on SrTiO3.
J. J. Lee,F. Schmitt,Robert G. Moore,Steven Johnston,Yong-Tao Cui,Wei Li,M. Yi,Zhongkai Liu,Makoto Hashimoto,Yi Zhang,D. H. Lu,Thomas P. Devereaux,D.-H. Lee,Zhi-Xun Shen +13 more
TL;DR: High-resolution angle-resolved photoemission spectroscopy results reveal an unexpected characteristic of the single-unit-cell FeSe/SrTiO3 system: shake-off bands suggesting the presence of bosonic modes, most probably oxygen optical phonons in SrTiO2, which couple to the FeSe electrons with only a small momentum transfer.
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Extreme sensitivity of superconductivity to stoichiometry in Fe 1+δ Se
Tyrel M. McQueen,Qingzhen Huang,Vadim Ksenofontov,Claudia Felser,Qiang Xu,Henny W. Zandbergen,Yew San Hor,Jared M. Allred,A. J. Williams,Dongxia Qu,Joseph Checkelsky,Nai Phuan Ong,Robert J. Cava +12 more
TL;DR: In this article, it was shown that superconductivity in Fe1+?Se, which can be considered the parent compound of the superconducting arsenide family, is destroyed by very small changes in stoichiometry.
Tailoring the nature and strength of electron-phonon interactions in the SrTiO3(001) 2D electron liquid.
Zhiming Wang,Zhiming Wang,S. McKeown Walker,Anna Tamai,Yao Wang,Yao Wang,Zoran Ristić,Flavio Y. Bruno,A. de la Torre,S. Riccò,Nicholas C. Plumb,Ming Shi,P. Hlawenka,Jaime Sánchez-Barriga,Andrei Varykhalov,Timur K. Kim,Moritz Hoesch,Phil D. C. King,Worawat Meevasana,Ulrike Diebold,Joël Mesot,Joël Mesot,Joël Mesot,Brian Moritz,Thomas P. Devereaux,Thomas P. Devereaux,Milan Radovic,Felix Baumberger,Felix Baumberger,Felix Baumberger +29 more
TL;DR: The prototypical two-dimensional electron liquid at the SrTiO3(001) surface is used to reveal a remarkably complex evolution of electron-phonon coupling with the tunable carrier density of this system, and constraints on the theoretical description of superconductivity are placed.