Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates

Abstract

We investigate the magnetic excitations in view of the recent reports suggesting that the spin-wave energy may exhibit a significant dependence on the in-plane strain of a thin film of La${}_2$CuO${}_4$. The nature of dependence, as we find, can be explained naturally within a two-orbital model based on the $d_{x^2-y^2}$ and $d_{3z^2-r^2}$ orbitals. In particular, as the orbital-splitting energy between the $d_{x^2-y^2}$ and $d_{3z^2-r^2}$ orbitals increases with compressive strain, the zone-boundary spin-wave energy hardens. However, the hardening persists only until the orbital splitting reaches $\sim$ 2eV, beyond which there is no significant change. The behavior of zone-boundary spin-wave energy is explained in terms of the extent of hybridization between one of the exchange-split $d_{x^2-y^2}$ band which is nearly half filled and the $d_{3z^2-r^2}$ band. The role of second-order antiferromagnetic superexchange process involving the inter-orbital hopping is also discussed.

arXiv comment6 pages, 5 figures

References in corpus (33)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Spin waves and electronic interactions in La2CuO4
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Anomalous High-Energy Spin Excitations in La2CuO4
• Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
• Energy and symmetry of $dd$ excitations in undoped layered cuprates measured by Cu $L_3$ resonant inelastic x-ray scattering
• Phonon Assisted Multimagnon Optical Absorption and Long Lived Two-Magnon States in Undoped Lamellar Copper Oxides
• Spin excitations in a single La${}_2$CuO${}_4$ layer
• Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors
• Observation of a 500meV Collective Mode in La${}_{2-x}$Sr${}_x$CuO${}_4$ and Nd${}_2$CuO${}_4$
• Origin of the material dependence of $T_c$ in the single-layered cuprates
• Low energy theory of the t-t'-t''-U Hubbard Model at half-filling: interaction strengths in cuprate superconductors and an effective spin-only description of La_2CuO_4
• Strain-Engineering Mott-Insulating La${}_2$CuO${}_4$
• Direct Observation of Orbital Hybridisation in a Cuprate Superconductor
• Orbital mixture effect on the Fermi surface-$T_c$ correlation in the cuprate superconductors --- bilayer vs single layer
• Realistic many-body models for Manganese Monoxide under pressure
• Multiorbital Spin Susceptibility in a Magnetically Ordered State - Orbital versus Excitonic Spin Density Wave Scenario
• Effective Coulomb interactions in solids under pressure
• Strain-induced tuning of the electronic Coulomb interaction in 3d transition metal oxide perovskites
• Band Structure of Overdoped Cuprate Superconductors: Density Functional Theory Matching Experiments
• Quasiparticle self-consistent GW study of cuprates: electronic structure, model parameters, and the two-band theory for Tc
• Revealing the Coulomb interaction strength in a cuprate superconductor
• Damped spin excitations in a doped cuprate superconductor with orbital hybridization
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Spin-wave spectrum in La2CuO4 -- double occupancy and competing interaction effects
• Spin-charge coupling in a band ferromagnet: magnon-energy reduction, anomalous softening, and damping
• Orbital fluctuations, spin-orbital coupling, and anomalous magnon softening in an orbitally degenerate ferromagnet
• Hubbard-model description of the high-energy spin-spectral-weight distribution in La(2)CuO(4)
• Magnon dressing by orbital excitations in ferromagnetic planes of K${}_2$CuF${}_4$ and LaMnO${}_3$
• Orbital ordering transition in the single-layer manganites near half doping: a weak-coupling approach
• Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters
• Spin-wave excitations in the SDW state of doped iron pnictides

Cited by in corpus (1)

• Exact results for the Hubbard model on bipartite lattices in spatial dimensions $d>1$: Seven theorems from the full [SU(2)$\times$SU(2)$\times$U(1)]/${\mathbb{Z}}_2^2$ symmetry