Magnetically ordered state at correlated oxide interfaces: the role of random oxygen defects
arXiv:1205.1981 · doi:10.1007/s10948-012-2045-8
Abstract
Using an effective one-band Hubbard model with disorder, we consider magnetic states of the correlated oxide interfaces, where effective hole self-doping and a magnetially ordered state emerge due to electronic and ionic reconstructions. By employing the coherent potential approximation, we analyze the effect of random oxygen vacancies on the two-dimensional magnetism. We find that the random vacancies enhance the ferromagnetically ordered state and stabilize a robust magnetization above a critical vacancy concentration of about c=0.1. In the strong-correlated regime, we also obtain a nonmonotonic increase of the magnetization upon an increase of vacancy concentration and a substantial increase of the magnetic moments, which can be realized at oxygen reduced high-Tc cuprate interfaces.
8 pages, 2 figures, submitted to J Supercond Novel Magnetism (ICSM12 conference contribution)
References in corpus (8)
- Magnetic effects at the interface between nonmagnetic oxides
- Oxygen vacancies at titanate interfaces: two-dimensional magnetism and orbital reconstruction
- Spin, Orbital and Charge Order at the Interface between Correlated Oxides
- Interface hole-doping in cuprate-titanate superlattices
- Interface controlled electronic charge inhomogeneities in correlated heterostructures
- Electrostatic interface tuning in correlated superconducting heterostructures
- Mechanism of orbital reconstruction at the interfaces of transition metal oxides
- Electron-Polarization Coupling in Superconductor-Ferroelectric Superlattices