Abstract
Three different oxy-pnictides ‘REFeAsO’ compounds are prepared by simple and easy solid state single step method. Structural analysis is carried with the help of the X-ray technique and confirms that the obtained samples are phase pure and crystallized in tetragonal P4/nmm structure. Superconductivity is introduced by partial replacement of oxygen by Fluorine in NdFeAsO0.8F0.2, SmFeAsO0.8F0.2 and PrFeAsO0.8F0.2, with highest Tc(48K) in NdFeAsO0.8F0.2. SmFeAsO0.8F0.2 compound shows the highest upper critical field (Hc2) ∼ 377 Tesla, estimated using Ginzburg Landau, (GL). Critical current density doesn’t change significantly. The measured MR (magneto resistance) for PrFeAsO is 21.5%, whereas it is 16% for SmFeAsO. Here we report in brief an inter-comparison of various properties like electric and magnetic transport, magneto-resistance for these synthesized oxy-pnictide compounds.
Highlights
Superconductivity is introduced by partial replacement of oxygen by Fluorine in NdFeAsO0.8F0.2, SmFeAsO0.8F0.2 and PrFeAsO0.8F0.2, with highest Tc(48K) in NdFeAsO0.8F0.2
Iron atoms are tetrahedrally coordinated with either pnictogen (P or As, group elements) or chalcogen (S, Se and Te, group elements) anions, form planer layers which are sandwiched by other layers of alkali, alkali earth or rare earth metal and oxygen/fluorine
The synthesized pristine, LaFeAsO, GdFeAsO, NdFeAsO, SmFeAsO and PrFeAsO compounds crystallized in tetragonal P4/nmm structure
Summary
Iron atoms are tetrahedrally coordinated with either pnictogen (P or As, group elements) or chalcogen (S, Se and Te, group elements) anions, form planer layers which are sandwiched by other layers of alkali, alkali earth or rare earth metal and oxygen/fluorine. These layers either donate charges or make the internal pressure to the FeAs layers such that they influence the electronic properties and are considered to be responsible for superconductivity, similar to the Cu-O planes in Cuprates. We report comparative studies of synthesized iron pnictide in its pristine form and in their superconducting state, with different rare earth (4f) elements. The MR for ground sate of Pr and Sm has been compared in this communication
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