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A sample of vanadium with 2 at.% of Fe-57 was prepared by the arc-melting technique, annealed in a vacuum at 1270 K for 2 h and measured by Fe-57 transmission Mossbauer spectroscopy in the temperature range 1.4 K-300 K as well as using SQUID magnetometer in the temperature range 1.8 K-300 K. The magnetic data showed that the (V0.98Fe0.02)-Fe-57 alloy is a type-II superconductor with transition temperature T-c = 3.7 K and upper critical magnetic field H-c2 close to 4.8 kOe at 1.8 K. The observed Mossbauer spectra consist of one doublet with small quadrupole splitting over the whole temperature range studied. The weighted average of the two Debye temperature values from temperature dependence of the isomer shift and the total spectral was estimated to be approximately 602(90) K for Fe-57. Abnormal behaviour of the hyperfine parameters at or near T-c was not observed.

Physical Properties of Superconducting V0.9857Fe0.02 Alloy Studied by TMS and SQUID Magnetometer

Physical Properties of Superconducting V_0.98⁵⁷Fe_0.02 Alloy Studied by TMS and SQUID Magnetometer