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Upper Critical and Irreversibility Fields in Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.91Co0.09)2As2 Pnictide Bulk Superconductors

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Abstract

A comprehensive study of upper critical and irreversibility magnetic fields in Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.91Co0.09)2As2 polycrystalline bulk pnictide superconductors was made in pulsed fields of up to 65 T. The full-magnetic field-temperature (HT) phase diagrams, starting at 1.5 K, were obtained. Possible multi-band structure of these materials is lumped into effective parameters of the single-band model. The higher temperature, upper critical field H c2 data is well described by the one-band Werthamer–Helfand–Hohenberg (WHH) model. The large values of the Maki parameter (6.5 and 4.4) indicate that the Zeeman pair breaking dominates over the orbital pair breaking and spin-paramagnetic pair-breaking effect is significant in these materials. The fitted WHH curve departs from the experimental data at low temperatures, particularly for the Ba(Fe0.91Co0.09)2As2 sample, suggesting an emergence of a new phase that can be attributed to the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state. The H c2 temperature behavior can be described within a single-band model used in WHH with added finite-Q dependence to introduce FFLO instability. The anisotropy in the behavior of the upper critical field could also explain the data.

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Acknowledgments

A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490, the Department of Energy and the State of Florida.

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Correspondence to Martin Nikolo.

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Nikolo, M., Singleton, J., Solenov, D. et al. Upper Critical and Irreversibility Fields in Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.91Co0.09)2As2 Pnictide Bulk Superconductors. J Supercond Nov Magn 30, 561–568 (2017). https://doi.org/10.1007/s10948-016-3727-4

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  • DOI: https://doi.org/10.1007/s10948-016-3727-4

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