title: Local microscopic properties and annealing effect of Rb0.85Fe1.9Se2single crystals.
abstract: Investigation of mesoscopically phase-separated Rb0.85Fe1.9Se2single 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, Tp, 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 Rb0.85Fe1.9Se2show strong magnetic texture, indicating the perpendicular to the ab-plane orientation of the iron magnetic moments. It was found that the annealing at Tpcauses a systematic decrease of the isomer shift of the doublet by 0.02(1) mm s-1.
authors.affiliation: Faculty of Physics, University of Białystok, K. Ciołkowskiego Str. 1L, PL-15245 Białystok, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Szymański
authors.forename: W
authors.initials: W
authors.lastname: Olszewski
authors.forename: D
authors.initials: D
authors.lastname: Satuła
authors.forename: A
authors.initials: A
authors.lastname: Matwiejczyk
authors.forename: D J
authors.initials: DJ
authors.lastname: Gawryluk
authors.forename: A
authors.initials: A
authors.lastname: Krztoń-Maziopa
authors.forename: R
authors.initials: R
authors.lastname: Puźniak
authors.forename: A
authors.initials: A
authors.lastname: Wiśniewski