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We present data for the temperature dependence of the magnetic penetrationdepth lambda(T), heat capacity C(T), resistivity R(T) and magnetic torque ?taufor highly homogeneous single crystal samples of Fe1:0Se0:44(4)Te0:56(4).lambda(T) was measured down to 200mK in zero field. We find lambda(T) follows apower law lambda~T^n with n = 2.2 +/- 0.1. This is similar to some 122iron-arsenides and likely results from a sign-changing pairing state combinedwith strong scattering. Magnetic fields of up to B =55T or 14T were used forthe ? tau(B) and C(T)/R(T) measurements respectively. The specific heat,resistivity and torque measurements were used to map out the (H,T) phasediagram in this material. All three measurements were conducted on exactly thesame single crystal sample so that the different information revealed by theseprobes is clearly distinguished. Heat capacity data strongly resemble thosefound for the high Tc cuprates, where strong fluctuation effects wipe-out thephase transition at Hc2. Unusually, here we find the fluctuation effects appearto be strongly anisotropic.

Anisotropic fluctuations and quasiparticle excitations in FeSe_0.5Te_0.5