Terahertz Spin-Orbital Excitations in the paramagnetic state of multiferroic Sr${}_2$FeSi${}_2$O${}_7$

Abstract

We studied the novel multiferroic material Sr${}_2$FeSi${}_2$O${}_7$, and found 3 absorption modes above the magnetic ordering transition temperature using time-domain terahertz spectroscopy. These absorption modes can be explained as the optical transitions between the spin-orbit coupling and crystal field split 3d${}^6$ Fe${}^{2+}$ ground state term in this material. Consideration of the compressed tetrahedral environment of the Fe${}^{2+}$ site is crucial to understand the excitations. We point out, however, discrepancies between the single-site atomic picture and the experimental results.

arXiv comment5 pages, 3 figures, 1 table. Submitted. Small correction to figure 3 and corresponding discussion

References in corpus (21)

• Spin current and magneto-electric effect in non-collinear magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Possible evidence for electromagnons in multiferroic manganites
• Dynamical magneto-electric coupling in helical magnets
• Ferroelectricity induced by spin-dependent metal-ligand hybridization in Ba${}_2$CoGe${}_2$O${}_7$
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Giant directional dichroism of terahertz light in resonance with magnetic excitations of the multiferroic oxide BaCo${}_2$Ge${}_2$O${}_7$
• Chirality of Matter Shows Up via Spin Excitations
• A hierarchy of bound states in the 1D ferromagnetic Ising chain CoNb${}_2$O${}_6$ investigated by high resolution time-domain terahertz spectroscopy
• Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
• Spin-stretching modes in anisotropic magnets: spin-wave excitations in the multiferroic Ba2CoGe2O7
• Low Energy Electrodynamics of Novel Spin Excitations in the Quantum Spin Ice Yb${}_2$Ti${}_2$O${}_7$
• Theory of magnetoelectric resonance in two-dimensional $S=3/2$ antiferromagnet $\mathrm{B}{\mathrm{a}}_2\mathrm{CoG}{\mathrm{e}}_2{\mathrm{O}}_7$ via spin-dependent metal-ligand hybridization mechanism
• Theoretical investigation of magnetoelectric effects in Ba2CoGe2O7
• Spin nematic interaction in multiferroic compound Ba${}_2$CoGe${}_2$O${}_7$
• Singlet-triplet excitations and long range entanglement in the spin-orbital liquid candidate FeSc2S4
• Multiboson spin-wave theory for Ba2CoGe2O7, a spin-3/2 easy-plane Neel antiferromagnet with strong single-ion anisotropy
• Jahn-Teller distortions as a novel source of multiferroicity
• Zero and finite temperature mean field study of magnetic field induced electric polarization in Ba2CoGe2O7
• Spin-orbiton and quantum criticality in FeSc2S4
• Theory of excitations and dielectric response at a spin-orbital quantum critical point

Cited by in corpus (8)

• Physical properties of a quasi-two-dimensional square lattice antiferromagnet Ba${}_2$FeSi${}_2$O${}_7$
• Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
• Magnetic and vibronic THz excitations in Zn doped Fe${}_2$Mo${}_3$O${}_8$
• Terahertz Dielectric Analysis and Spin-Phonon Coupling in Multiferroic GeV${}_4$S${}_8$
• Magneto-electric properties and low-energy excitations of multiferroic FeCr2S4
• Ring-Exchange Interaction Effects on Magnons in Dirac Magnet CoTiO${}_3$
• Field-induced spin level crossings within a quasi-XY antiferromagnetic state in Ba${}_2$FeSi${}_2$O${}_7$
• Broadband Circular Polarization Time-Domain Terahertz Spectroscopy