The electronic phase diagram of the LaO 1− x F x FeAs superconductor
Hubertus Luetkens,Hans-Henning Klauss,M. Kraken,F. J. Litterst,T. Dellmann,T. Dellmann,Rüdiger Klingeler,Christian Hess,Rustem Khasanov,Anthony A. Amato,C. Baines,M. Kosmala,O. Schumann,Markus Braden,J. E. Hamann-Borrero,N. Leps,A. Kondrat,Günter Behr,J. Werner,Bernd Büchner +19 more
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In this paper, the structural and electronic phase diagram is investigated by means of X-ray scattering, muon spin relaxation and Mossbauer spectroscopy on the series LaO(1-x)F(x)FeAs.Abstract:
The competition of magnetic order and superconductivity is a key element in the physics of all unconventional superconductors, for example in high-transition-temperature cuprates, heavy fermions and organic superconductors. Here superconductivity is often found close to a quantum critical point where long-range antiferromagnetic order is gradually suppressed as a function of a control parameter, for example charge-carrier doping or pressure. It is believed that dynamic spin fluctuations associated with this quantum critical behaviour are crucial for the mechanism of superconductivity. Recently, high-temperature superconductivity has been discovered in iron pnictides, providing a new class of unconventional superconductors. Similar to other unconventional superconductors, the parent compounds of the pnictides show a magnetic ground state and superconductivity is induced on charge-carrier doping. In this Letter the structural and electronic phase diagram is investigated by means of X-ray scattering, muon spin relaxation and Mossbauer spectroscopy on the series LaO(1-x)F(x)FeAs. We find a discontinuous first-order-like change of the Neel temperature, the superconducting transition temperature and the respective order parameters. Our results strongly question the relevance of quantum critical behaviour in iron pnictides and prove a strong coupling of the structural orthorhombic distortion and the magnetic order both disappearing at the phase boundary to the superconducting state.read more
Citations
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The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
TL;DR: The response of the worldwide scientific community to the discovery in 2008 of superconductivity at T c'='26'K in the Fe-based compound LaFeAsO1−x F x has been very enthusiastic.
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Superconductivity in iron compounds
TL;DR: A detailed review of the superconductivity of FePnictide and chalcogenide (FePn/Ch) superconductors can be found in this paper.
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High-temperature superconductivity in iron-based materials
TL;DR: The surprising discovery of high-temperature superconductivity in a material containing a strong magnet (iron) has led to thousands of publications as discussed by the authors, and it becomes clear what we know and where we are headed.
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Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure
Sergey A. Medvedev,Tyrel M. McQueen,I. A. Troyan,Taras Palasyuk,Mikhail Eremets,Robert J. Cava,S. Shahab Naghavi,Frederick Casper,Vadim Ksenofontov,Gerhard Wortmann,Claudia Felser +10 more
TL;DR: In this article, the magnetic and electronic phase diagram of β-Fe1.01Se has been analyzed and the transition temperature increases from 8.5 to 36.7 K under an applied pressure of 8.9 GPa.
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To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
TL;DR: In this paper, the authors present a summary of experimental reports on newly discovered iron-based superconductors as they were known at the end of 2008 and introduce experimental results that reveal basic physical properties in the normal and superconducting states.
References
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Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K
TL;DR: It is reported that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site and exhibits a trapezoid shape dependence on the F- content.
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Mössbauer Spectroscopy
TL;DR: The Mössbauer Effect Methodology as mentioned in this paper is a well-known method for nuclear power analysis and it has been used extensively in the nuclear power research community, e.g., in the first Symposium.
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Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems
Clarina Dela Cruz,Clarina Dela Cruz,Qingzhen Huang,J. W. Lynn,Jiying Li,Jiying Li,William Ratcliff,Jerel L. Zarestky,Herbert A. Mook,G. F. Chen,J. L. Luo,Nan Wang,Pengcheng Dai,Pengcheng Dai +13 more
TL;DR: The role of magnetism in the superconductivity that occurs when mobile 'electrons' or 'holes' are doped into the antiferromagnetic parent compounds of rare-earth iron-based oxide systems was investigated in this paper.
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Iron-Based Layered Superconductor: LaOFeP
Yoichi Kamihara,Hidenori Hiramatsu,Masahiro Hirano,Ryuto Kawamura,Hiroshi Yanagi,Toshio Kamiya,Hideo Hosono +6 more
TL;DR: Magnetic and electrical resistivity measurements verify the occurrence of the superconducting transition at approximately 4 K in an iron-based layered oxy-pnictide LaOFeP.
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Magnetically mediated superconductivity in heavy fermion compounds
Neil D. Mathur,F. M. Grosche,Stephen Julian,I. R. Walker,D. M. Freye,R. K. W. Haselwimmer,G. G. Lonzarich +6 more
TL;DR: In this article, it was shown that the charge carriers are bound together in pairs by magnetic spin-spin interactions in heavy fermion superconductors CePd2Si2 and CeIn3.