Comparative study of upper critical field H_c2 and second magnetization peak H_sp in hole- and electron-doped BaFe₂As₂ superconductor

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D. L. Sun, Y. Liu, and C. T. Lin
Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany

Received 29 July 2009; revised 10 September 2009; published 12 October 2009

Acomparative study of the upper critical field H_c2 and secondmagnetization peak H_sp was performed using high-quality single crystals ofhole-doped Ba_0.68K_0.32Fe₂As₂ and electron-doped BaFe_1.85Co_0.15As₂ and BaFe_1.91Ni_0.09As₂. The H_c2 wasextracted from both resistivity and magnetization measurements using varying magneticfields on Hc and H [perpendicular] c orientations. The anisotropic ratio, gamma =H c2[perpendicular] c /H c2|| c ,was observed to decrease to ~2.5 for the hole-doped and~3.0 for both electron-doped samples as the magnetic fields wereincreased up to 9 T. It demonstrates that the anisotropicproperties only show slight change by doping aliovalent ions eitherin or out-of the basal plane of FeAs. For thehole-doped Ba_0.68K_0.32Fe₂As₂ the H_c2 and H_sp shift toward the highertemperature and higher field regime in the temperature-normalized (T/T_c) vortexphase diagram, suggesting a stronger vortex pinning by the comparisonwith the electron-doped BaFe_1.85Co_0.15As₂ and BaFe_1.91Ni_0.09As₂. In contrast to theAs-deficiency or inhomogeneous doping distribution of K, Co, and Ni,the dense pinning centers in Ba_0.68K_0.32Fe₂As₂ may be attributed tothe disordered structural domains and suggested to be responsible forthe intrinsic disorder and anisotropy of iron arsenides.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.144515
DOI:	10.1103/PhysRevB.80.144515
PACS:	74.70.Dd; 74.25.Op; 74.25.Qt 74.70.Dd Superconducting ternary, quaternary and multinary compounds 74.25.Op Mixed state, critical fields, and surface sheath 74.25.Qt Vortex lattices, flux pinning, flux creep YEAR: 2009
KEYWORDS:	barium compounds, cobalt compounds, doping, electrical resistivity, flux pinning, high-temperature superconductors, iron compounds, magnetic anisotropy, nickel compounds, phase diagrams, potassium compounds, superconducting critical field

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