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25 April 2024

» arxiv » 0810.0699

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Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2
A. Yamamoto ; J. Jaroszynski ; C. Tarantini ; L. Balicas ; J. Jiang ; A. Gurevich ; D.C. Larbalestier ; R. Jin ; A.S. Sefat ; M.A. McGuire ; B.C. Sales ; D.K. Christen ; D. Mandrus ;
Date:	3 Oct 2008
Abstract:	We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe1-xCox)2As2. Unlike the HTS cuprates and 1111-phase oxypnictides, Ba(Fe1-xCox)2As2 showed practically no broadening of the resistive transitions under magnetic fields up to 45 T. The mass anisotropy gamma = Hc2ab/Hc2c deduced from the slopes of the upper critical field dHc2ab/dT = 4.9T/K and dHc2c/dT = 2.5T/K decreases from ~2 near Tc, to ~1.5 at lower temperatures. We observed the irreversibility field close to Hc2, and a rather unusual symmetric volume pinning force curve Fp(H) suggestive of strong pinning nano-structure.
Source:	arXiv, 0810.0699
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