RbxBayMn[3-(x + 2y)]/2[Fe(CN)6]·zH2O prussian blue analogues: Controlling magnetic ordering by alkaline earth metal cation substitution and magnetic field

Abstract

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Soft x-ray absorption spectroscopy study of the electronic structures of the MnFe Prussian blue analogs (RbxBay)Mn[3−(Lee1, Seong2, Kim3 et al. 2017Phys. Rev. BSelf Cite9010View full textAdd to dashboardCite

“…Note that the very weak (∼0.4%) but finite Mn 2p XMCD signals are observed in all of (Rb x Ba y )MnFe PBAs above the Néel temperature (T N ∼ 10.6-13.5 K) [11] [see Fig. 7(d)].…”

“…For example, some MnFe PBAs undergo structural phase transitions from an fcc (F43m) structure at high temperature (HT) to a tetragonal (I4m2) structure at low temperature (LT) [6] present study has an antiparallel stacking of ferromagnetic sheets along the crystallographic c direction (see Fig. 1) [11]. Understanding the physical and magnetic properties of the PBAs is very important, not only for their technical application but also for the fundamental scientific aspect.…”

“…Figure 1 shows the tetragonal crystal structure of (Rb x Ba y )Mn z [Fe(CN) 6 ] PBA at LT, which belongs to the I4m2 space group. Lattice constants are a = 7.45Å and c = 10.55Å when y = 0 [11], and they decrease slightly with increasing Ba 2+ concentration (y). Due to the stoichiometry of these compounds, some of the Fe, C, and N sites are vacant and the O atoms of H 2 O molecules occupy the empty N sites.…”

“…The main feature of this structure is the presence of the 3D network of Mn-NC-Fe chains along the (110) and (001) directions. Hence, depending on the relative orientations among the p σ , p π , Mn e g and t 2g , and Fe t 2g orbitals, the ferromagnetic ordering in the ab plane and the antiferromagnetic ordering along the c axis are realized [11].…”

“…In this work, we have studied the electronic structures of Ba-substituted (Rb 6 ] PBAs [11], so that the photoinduced magnetization transition is not expected. Figure 1 shows the tetragonal crystal structure of (Rb x Ba y )Mn z [Fe(CN) 6 ] PBA at LT, which belongs to the I4m2 space group.…”