Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals

Abstract

The radio frequency penetration depth was measured in the superconductor (Ba${}_{0.55}$K${}_{0.45}$)Fe${}_2$As${}_2$ under pulsed magnetic fields extending to 60 tesla and down to 14 K. Using these data we are able to infer a $H_{c2}(T)$, $H-T$ phase diagram, for applied fields parallel and perpendicular to the crystallographic c-axis. The upper critical field curvature is different for the respective orientations but they each remain positive down to 14 K. The upper critical field anisotropy is moderate, $\approx 3.5$ close to $T_c$, and drops with the decrease of temperature, reaching $\approx 1.2$ at $14K$. These data and analysis indicate that (i) (Ba${}_{0.55}$K${}_{0.45}$)Fe${}_2$As${}_2$ anisotropy diminishes with temperature and has an unusual temperature dependence, (ii) $H_{c2}(T=0)$ for this compound may easily approach fields of 75 tesla.

published version

References in corpus (5)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering

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