Mossbauer studies of Ba(Fe1-xNix)(2)As-2

TitleMossbauer studies of Ba(Fe1-xNix)(2)As-2
Publication TypeJournal Article
Year of Publication2010
AuthorsNowik I, Felner I, Ni N, Bud'ko SL, Canfield PC
Journal TitleJournal of Physics-Condensed Matter
Date Published09/08
ISBN Number0953-8984
Accession NumberISI:000281422100022

We present detailed Fe-57 Mossbauer effect spectroscopy (MS) measurements at various temperatures for Ba(Fe1-xNix)(2)As-2. The isomer shift values for all samples are in the range of 0.42 +/- 0.02 mm s(-1), indicating a typical metallic state of divalent Fe ions. The MS spectra of the magnetic samples (up to x = 0.024) are well reproduced by spin density waves subspectra. Both the magnetic ordering temperatures T-M and the average magnetic hyperfine fields H-eff, decrease with x. The H-eff values scale linearly with T-M. For higher x values the samples become superconducting and the MS spectra below and above T-C are almost identical, indicating that the MS technique are not sensitive enough to the superconducting transition.

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