Local microscopic properties and annealing effect of Rb&lt;sub&gt;0.85&lt;/sub&gt;Fe&lt;sub&gt;1.9&lt;/sub&gt;Se&lt;sub&gt;2&lt;/sub&gt; single crystals

Szymański, K.; Olszewski, W.; Satuła, D.; Matwiejczyk, A.; Gawryluk, D.J.; Krztoń-Maziopa, A.; Puźniak, R.; Wiśniewski, A.

doi:10.1088/1361-648X/aa5bdd

Local microscopic properties and annealing effect of Rb_0.85Fe_1.9Se₂ single crystals

Szymański K, Olszewski W, Satuła D, Matwiejczyk A, Gawryluk DJ, Krztoń-Maziopa A, Puźniak R & Wiśniewski A

Citation

Szymański, K., Olszewski, W., Satuła, D., Matwiejczyk, A., Gawryluk, D. J., Krztoń-Maziopa, A., … Wiśniewski, A. (2017). Local microscopic properties and annealing effect of Rb_0.85Fe_1.9Se₂ single crystals. Journal of Physics: Condensed Matter, 29(14), 145604 (8 pp.). https://doi.org/10.1088/1361-648X/aa5bdd

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:4175

Investigation of mesoscopically phase-separated Rb_0.85Fe_1.9Se₂ single crystals has been performed and two iron sites: nonmagnetic and magnetic ones, were observed by Mössbauer spectroscopy. The softening of the nonmagnetic one, having clearly more soft dynamics, was found to be gained further by the annealing of the single crystals at phase separation temperature, T_p, leading to the reduction of size of initially separated domains and their more homogenous distribution in the tetragonal matrix of the studied sample. The magnetic Fe sites of Rb_0.85Fe_1.9Se₂ show strong magnetic texture, indicating the perpendicular to the ab-plane orientation of the iron magnetic moments. It was found that the annealing at T_p causes a systematic decrease of the isomer shift of the doublet by 0.02(1) mm s^-1.