Crystal growth and physical properties of Na-doped BaFe2As2 superconducting single crystals

Authors: S Aswartham (Leibniz Institute for Solid State and Materials Research) , M Abdel-hafiez (Leibniz Institute for Solid State and Materials Research) , D Bombor (Leibniz Institute for Solid State and Materials Research) , A. U. B. Wolter (Leibniz Institute for Solid State and Materials Research) , M Kumar (Leibniz Institute for Solid State and Materials Research) , C Hess (Leibniz Institute for Solid State and Materials Research) , D. V. Evtushinsky (Leibniz Institute for Solid State and Materials Research) , V. B. Zabolotnyy (Leibniz Institute for Solid State and Materials Research) , A. A. Kordyuk (Leibniz Institute for Solid State and Materials Research) , S. V. Borisenko (Leibniz Institute for Solid State and Materials Research Dresden) , S Wurmehl (Leibniz Institute for Solid State and Materials Research) , B Buechner (Leibniz Institute for Solid State and Materials Research) , T. K. Kim (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: DPG Spring meeting of the condensed matter section
Peer Reviewed: No

State: Published (Approved)
Published: March 2013

Abstract: Single crystals of Ba1-xNaxFe2As2 with x = 0, 0.25, 0.35, 0.4 were grown using a self-flux high temperature solution growth technique. The superconducting and normal state properties were studied by temperature dependent magnetic susceptibility, electrical resistivity and specific heat revealing that the magnetic and structural transition is rapidly suppressed upon Na-substitution at the Ba-site in BaFe2As2, giving rise to superconductivity. A superconducting transition as high as 34 K is reached for a Na-content of x = 0.4. The positive Hall coefficient confirms that the substitution of Ba by Na results in hole-doping similarly to the substitution of Ba by K. Angle resolved photoemission spectroscopy was performed on all Ba1-xNaxFe2As2 crystals. The Fermi surface of hole-doped Ba1-xNaxFe2As2 is to high extent the same as the Fermi surface found for the K-doped sister compounds, suggesting a similar impact of the substitution of Ba by either K or Na on the electronic band dispersion at the Fermi level.

Journal Keywords: Angular Distribution; Barium Compounds; Crystal-Phase Transformations; Doped Materials; Electron Spectra; Emission Spectra; Fermi Level; Iron Arsenides; Magnetic Susceptibility; Monocrystals; Photoelectric Emission; Sodium Additions; Specific Heat; Superc

Subject Areas: Physics


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Added On: 26/02/2016 11:48

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