Crystal field excitations and magnons: Their roles in oxyselenides Pr2O2M2OSe2(

Abstract

We present the results of neutron scattering experiments to study the crystal and magnetic structures of the Mottinsulating transition metal oxyselenides Pr 2 O 2 M 2 OSe 2 (M = Mn, Fe). The structural role of the non-Kramers Pr 3+ ion was investigated, and analysis of Pr 3+ crystal field excitations was performed. Long-range order of Pr 3+ moments in Pr 2 O 2 Fe 2 OSe 2 can be induced by an applied magnetic field.

Local structure of Mott insulating iron oxychalcogenides La2O2Fe2OM2(M=Karki1, Alfailakawi2, Frandsen3 et al. 2021Phys. Rev. B

“…4). However, no discontinuity was observed in the case of M = S. Such a finding is consistent with previous reports of c-lattice discontinuities in oxyselenides [19,53,54] and the less prominent occurrence of this behavior in the oxysulfides [18]. The discontinuities were attributed to magnetostrictive effects in the oxyselenides.…”

Local Structure of Mott Insulating Iron Oxychalcogenides La$_{2}$O$_{2}$Fe$_{2}$O$M$$_{2}$ ($M$ = S, Se)

“…4). However, no discontinuity was observed in the case of M = S. Such a finding is consistent with previous reports of clattice discontinuities in oxyselenides [18,52,53] and the less prominent occurrence of this behavior in the oxysulfides [17]. The discontinuities were attributed to magne-tostrictive effects in the oxyselendies.…”

Magnetic and structural properties of the iron oxychalcogenides La2O2Fe2OM2(MFreelon1, Yamani2, Swainson3 et al. 2019Phys. Rev. B11290View full textAdd to dashboardCite

“…Oxygen atoms are contained in the RE layers remniscent of the charge resevoirs of high-T c cuprates. [4,5] Specific attention has been given to iron oxychalcogenides [6][7][8][9] by investigators seeking to discover new iron-based materials in which high-T c superconductivity might be obtained by doping the Mott insulating state. [5,10,11] In addition, the electronic behavior of La 2 O 2 Fe 2 O(S, Se) 2 has been investigated.…”