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High-field electron spin resonance spectroscopy study of GdFeAsO1−xFx superconductors

We report a detailed investigation of GdO1−xFxFeAs (x=0, 0.07, and 0.14) samples by means of high-field and high-frequency electron spin resonance (HF-ESR) together with measurements of thermodynamic and transport properties. The parent GdOFeAs compound exhibits Fe long-range magnetic order below 12...

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Main Authors: Alfonsov, Alexey (Author) , Murányi, F. (Author) , Kataev, V. (Author) , Lang, G. (Author) , Leps, N. (Author) , Wang, L. (Author) , Klingeler, Rüdiger (Author) , Kondrat, A. (Author) , Hess, C. (Author) , Wurmehl, S. (Author) , Köhler, A. (Author) , Behr, G. (Author) , Hampel, S. (Author) , Deutschmann, M. (Author) , Katrych, S. (Author) , Zhigadlo, N. D. (Author) , Bukowski, Z. (Author) , Karpinski, J. (Author) , Büchner, B. (Author)
Format: Article (Journal)
Language:English
Published: 22 March 2011
In: Physical review. B, Condensed matter and materials physics
Year: 2011, Volume: 83, Issue: 9, Pages: 1-10
ISSN:1550-235X
DOI:10.1103/PhysRevB.83.094526
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.83.094526
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.83.094526
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Author Notes:A. Alfonsov, F. Murányi, V. Kataev, G. Lang, N. Leps, L. Wang, R. Klingeler, A. Kondrat, C. Hess, S. Wurmehl, A. Köhler, G. Behr, S. Hampel, M. Deutschmann, S. Katrych, N.D. Zhigadlo, Z. Bukowski, J. Karpinski, and B. Büchner
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Summary:We report a detailed investigation of GdO1−xFxFeAs (x=0, 0.07, and 0.14) samples by means of high-field and high-frequency electron spin resonance (HF-ESR) together with measurements of thermodynamic and transport properties. The parent GdOFeAs compound exhibits Fe long-range magnetic order below 128K, whereas both doped samples do not show such order and are superconducting with Tc=20 K (x=0.07) and Tc=45 K (x=0.14). The Gd3+ HF-ESR reveals an appreciable exchange coupling between Gd and Fe moments, through which the static magnetic order is clearly seen in the parent compound. Owing to this coupling, HF-ESR can probe sensitively the evolution of the magnetism in the FeAs planes upon F doping. It is found that in both superconducting samples, where the Fe long-range order is absent, there are short-range, static on the ESR time scale magnetic correlations between Fe spins. Their occurrence on a large doping scale may be indicative of the ground states’ coexistence.
Item Description:Im Titel ist die Zahl 1, das Zeichen - und der Buchstabe x jeweils tiefgestellt
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Physical Description:Online Resource
ISSN:1550-235X
DOI:10.1103/PhysRevB.83.094526

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