Physical Properties of Superconducting V0.9857Fe0.02 Alloy Studied by TMS and SQUID Magnetometer |
| R. Idczak, V. Tran
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-422 Wrocław, Poland |
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| A sample of vanadium with 2 at.% of 57Fe was prepared by the arc-melting technique, annealed in a vacuum at 1270 K for 2 h and measured by 57Fe transmission Mössbauer 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 V0.9857Fe0.02 alloy is a type-II superconductor with transition temperature Tc=3.7 K and upper critical magnetic field Hc2 close to 4.8 kOe at 1.8 K. The observed Mössbauer 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 57Fe. Abnormal behaviour of the hyperfine parameters at or near Tc was not observed. |
DOI:10.12693/APhysPolA.134.1066 topics: electronic structure of bulk materials, superconductivity, electronic structure calculations |