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We report an easy single step synthesis route of title compoundNdFeAsO0.80F0.20 superconductor having bulk superconductivity below 50 K. Thetitle compound is synthesized via solid-state reaction route by encapsulationin an evacuated (10-3 Torr) quartz tube. Rietveld analysis of powder X-raydiffraction data shows that compound crystallized in tetragonal structure withspace group P4/nmm. R(T)H measurements showed superconductivity with Tc (R=0)at 48 K and a very high upper critical field (Hc2) of up to 345 Tesla. Magneticmeasurements exhibited bulk superconductivity in terms of diamagnetic onsetbelow 50 K. The lower critical field (Hc1) is around 1000 Oe at 5 K. In normalstate i.e., above 60 K, the compound exhibited purely paramagnetic behavior andthus ruling out the presence of any ordered FeOx impurity in the matrix. Inspecific heat measurements a jump is observed in the vicinity ofsuperconducting transition (Tc) along with an upturn at below T=4 K due to theAFM ordering of Nd+3 ions in the system. The Thermo-electric power (TEP) isnegative down to Tc, thus indicating dominant carriers to be of n-type inNdFeAsO0.80F0.20 superconductor. The granularity of the bulk superconductingNdFeAsO0.8F0.2 sample is investigated and the intra and inter graincontributions have been individuated by looking at various amplitude andfrequencies of the applied AC drive magnetic field.

Physical property characterization of single step synthesized NdFeAsO0.80F0.20 bulk 50K superconductor