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The spin-fluctuation effect in the Se-substituted systemFe$_{1+\delta}$Te$_{1-x}$Se$_x$ ($x$ = 0, 0.05, 0.12, 0.20, 0.28, 0.33, 0.45,0.48 and 1.00; $0<\delta < 0.12$) has been studied by the measurements of theX-ray diffraction, the magnetic susceptibility under high magnetic fields andthe electrical resistivity under magnetic fields up to 14 T. The samples with$x$ = 0.05, 0.12, 0.20, 0.28, 0.33, 0.45 and 0.48 show superconductingtransition temperatures in the ranger of 10 K$\sim$14 K. We obtained theirintrinsic susceptibilities by the Honda-Owen method. A nearly linear-in-$T$behavior in magnetic susceptibility of superconducting samples was observed,indicating the antiferromagnetic spin fluctuations have a strong link with thesuperconductivity in this series. The upper critical field $\mu_0H_{c2}^{orb}$for $T\to$ 0 was estimated to exceed the Pauli paramagnetic limit. TheKadowaki-Woods and Wilson ratios indicate that electrons are stronglycorrelated in this system. Furthermore, the superconducting coherence lengthand the electron mean free path were also discussed. These superconductingparameters indicate that the superconductivity in theFe$_{1+\delta}$Te$_{1-x}$Se$_x$ system is unconventional.

Magnetic and Superconducting Properties of Single Crystals of Fe$_{1+\delta}$Te$_{1-x}$Se$_x$ System