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Influence of the Fe Concentration on the Superconducting Properties of Fe\(_{1-y}\)Se

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Abstract

We present a comparative study of electrical transport properties in the normal state and in the dissipative superconducting state between pure \(\beta \)-FeSe phase and Fe deficient Fe\(_{1-y}\)Se crystals. We discuss the influence of the intergrowth of the magnetic hexagonal phase (Fe\(_7\)Se\(_8\)) in Fe deficient samples when compared to pure \(\beta \)-FeSe samples. In the superconducting state, we measured the \(ab\)-plane electrical resistivity with magnetic field up to 16 T and the electrical resistivity as a function of the angle between the \(c\) axis and the applied field. The angular dependence at fixed temperature below the superconducting critical temperature, \(T_c(H=0)\), is very different for both sets of crystals. The Fe deficient samples display a vortex pinning-related feature at \(\sim \)57\(^\circ \) off the plane while the pure \(\beta \)-FeSe phase samples show the persistence of a strong angular-dependent magnetoresistance characteristic of the normal state electronic structure.

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Acknowledgments

We thank F. Gennari for help in sample preparation. We thank Conicet PIP11220090100448 and Sectyp U. N. Cuyo for financial support.

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Correspondence to M. V. Ale Crivillero.

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Amigó, M.L., Ale Crivillero, M.V., Franco, D.G. et al. Influence of the Fe Concentration on the Superconducting Properties of Fe\(_{1-y}\)Se. J Low Temp Phys 179, 15–20 (2015). https://doi.org/10.1007/s10909-014-1255-9

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  • DOI: https://doi.org/10.1007/s10909-014-1255-9

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