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Inﬂuence of the Fe Concentration on the Superconducting Properties of Fe 1 − y Se

We present a comparative study of electrical transport properties in the normal state and in the dissipative superconducting state between pure β -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 β -FeSe samples. In the superconducting state, we measured the ab -plane electrical resistivity with magnetic ﬁeld up to 16T 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 ∼ 57 ◦ off the plane while the pure β -FeSe phase samples show the persistence of a strong angular-dependent magnetoresistance characteristic of the normal state electronic structure.