TROPEANO M.

(Pr0.55Ca0.45)(Mn1−yCry)O3 (with y = 0.00, 0.03 and 0.06) have been prepared by means of a solid-state reaction from stoichiometric powder mixtures of binary oxides. XRPD reveals the formation of the perovskite-type compound for the whole compositions; no evidence for secondary phases may be detected. The structural refinements have been...

(La1−xCax)(Mn1−yMy)O3 (x = 0.37, 0.50, 0.75; M=Cr, Ni; y = 0.03, 0.08) compounds have been prepared reacting stoichiometric amounts of binary oxides at high temperature. The samples were characterised by means of XRPD analysis at room temperature, followed by Rietveld refinements, revealing that all these compounds crystallize with an...

A comparative study of thermal properties of SmFeAsO, SmFeAsO0.93F0.07, and SmFeAsO0.85F0.15 samples is presented. Specific heat and thermal conductivity show clear evidence of the spin-density wave SDW ordering below TSDW135 K in undoped SmFeAsO. At low level of F doping, SmFeAsO0.93F0.07, SDW ordering is suppressed and superconducting...

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We measure magnetotransport of F-doped SmFeAsO samples up to 28 T and we extract the upper critical fields, using different criteria. In order to circumvent the problem of criterion-dependent Hc2 values, we suggest a thermodynamic estimation of the upper critical field slope dHc2 /dT based on the analysis of conductivity fluctuations in the...