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

M. M. Altarawneh, K. Collar, C. H. Mielke, N. Ni, S. L. Bud’ko, and P. C. Canfield
Phys. Rev. B 78, 220505(R) – Published 16 December 2008

Abstract

The radio frequency penetration depth was measured in the superconductor (Ba0.55K0.45)Fe2As2 under pulsed magnetic fields extending to 60 T and down to 14 K. Using these data we are able to infer a Hc2(T), HT 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 remains positive down to 14 K. The upper critical-field anisotropy is moderate, 3.5 close to Tc, and drops with the decrease in temperature, reaching 1.2 at 14 K. These data and analysis indicate that (i) (Ba0.55K0.45)Fe2As2 anisotropy diminishes with temperature and has an unusual temperature dependence and (ii) Hc2(T=0) for this compound may easily approach fields of 75 T.

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  • Received 28 July 2008

DOI:https://doi.org/10.1103/PhysRevB.78.220505

©2008 American Physical Society

Authors & Affiliations

M. M. Altarawneh, K. Collar, and C. H. Mielke

  • MPA-NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

N. Ni, S. L. Bud’ko, and P. C. Canfield

  • Department of Physics and Astronomy, Ames Laboratory US DOE, Iowa State University, Ames, Iowa 50011, USA

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Issue

Vol. 78, Iss. 22 — 1 December 2008

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