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New oxypnictide superconductors: PrOFe1−Co As by J. Prakash; S.J. Singh; D. Das; S. Patnaik; A.K. Ganguli is a Materials Science article available to read on EtoBox.

What is New oxypnictide superconductors: PrOFe1−Co As about?

Oxypnictides of the type PrOFe 1 À x Co x As (xr 0.3) were synthesized for the first time by the sealed tube method. All the compounds were found to be monophasic and crystallize in the tetragonal ZrCuSiAs type structure (space group= P4/nmm) and the lattice parameters (a and c) decrease with increase in cobalt content. M össbauer measurements of the compounds indicate low spin Fe 2 + in tetrahedral coordination. Resistivity and magnetization studies reveal superconducting transitions in compounds with 'x' =0.05, 0.10 and 0.15, with maximum transition temperature (T c ) at $ 14 K in the compound with 'x' =0.1. The variation of resistivity with temperature under different magnetic field has been studied to estimate the upper critical field (H c2 ) ($ 50.2 T for the 'x' =0.1 composition). The Seebeck and Hall coefficient (R H ) suggests electron type charge carriers in these compound and the charge carrier density increases with increase in Co-doping.

Who reads New oxypnictide superconductors: PrOFe1−Co As?

Author

J. Prakash; S.J. Singh; D. Das; S. Patnaik; A.K. Ganguli

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-4596)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)