Hexagonal Sr0.6Ba0.4MnO3: Spin and Dipole Coupling via Local Structure
arXiv:1807.01303 · doi:10.1016/j.jallcom.2019.05.003
Abstract
Hexagonal Sr0.6Ba0.4MnO3 (SBMO) follows P63/mmc symmetry where MnO6 octahedra are both face-shared (Mn2O9 bi-octahedra) and corner-shared via oxygen anion. It undergoes ferroelectric (FE) and antiferromagnetic (AFM) orderings close to the room temperature. Magnetic properties appear to be governed by intricate exchange interactions among Mn4+ ions within and in adjacent Mn2O9 bi-octahedra, contingent upon the local structural changes. Calculations based on our model spin-Hamiltonian reveal that the dominant linear AFM fluctuations between the Mn4+ ions of two oxygen-linked bi-octahedra result in short range correlations, manifest as a smooth drop in magnetization below 325 K. Competition between spin-exchange and local-strain is reckoned as responsible for the atypical magneto-electricity, obtained near the room temperature.
arXiv comment15 pages, 4 figures, 1 table, and 28 references
References in corpus (19)
- Magnetodielectric effect without multiferroic coupling
- Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
- Near room-temperature colossal magnetodielectricity and multiglass properties in partially-disordered La2NiMnO6
- Magnetic and electric phase control in epitaxial EuTiO from first principles
- Direct Evidence for Multiferroic Magnetoelectric Coupling in 0.9BiFeO3-0.1BaTiO3
- Infrared and THz studies of polar phonons and improper magnetodielectric effect in multiferroic BFO3 ceramics
- Biferroic YCrO3
- Engineering multiferroism in CaMnO
- Relaxations as key to the magnetocapacitive effects in the perovskite manganites
- Strong spin-phonon coupling in infrared and Raman spectra of SrMnO3
- Nanosize effect: Enhanced compensation temperature and existence of magneto-dielectric coupling in SmFeO3
- Symmetry breaking in hexagonal and cubic polymorphs of BaTiO3
- Mechanism of ferroelectric instabilities in non d^0 perovskites: LaCrO_3 versus CaMnO_3
- Spin-Coupled Local Distortions in Multiferroic Hexagonal HoMnO3
- Neutron Scattering Studies of the Ferroelectric Distortion and Spin Dynamics in the Type-1 Multiferroic Perovskite Sr0.56Ba0.44MnO3
- Fully Symmetrized VB Based Technique for Solving Exchange Hamiltonians of Molecular Magnets
- Microscopic Model for High-spin vs. Low-spin ground state in () magnetic clusters
- Quantum Paraelectric Glass State in SrCu3Ti4O12
- Magneto-Dielectric Behavior in