2020/12/03 by Dheeraj Kumar Singh, Yunkyu Bang
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Atomic orbital #Condensed matter physics #Cuprate #Electron #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Spin wave #Superconductivity #Superexchange #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.103.035122
published as Phys. Rev. B 103, 035122 (2021) · 6 pages, 5 figures
arxiv created 2020/12/03 · openalex publication_date 2021/01/15 · arxiv updated 2021/01/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 La2CuO4. The nature of dependence, as we find, can be explained naturally within a two-orbital model based on the d_x2\ensuremath-y2 and d_3z2\ensuremath-r2 orbitals. In particular, as the orbital-splitting energy between the d_x2\ensuremath-y2 and d_3z2\ensuremath-r2 orbitals increases with compressive strain, the zone-boundary spin-wave energy hardens. However, the hardening persists only until the orbital splitting reaches \ensuremath∼2 eV, 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_x2\ensuremath-y2 bands which is nearly half-filled and the d_3z2\ensuremath-r2 band. The role of second order antiferromagnetic superexchange process involving the interorbital hopping is also discussed.