Magnetically ordered state at correlated oxide interfaces: the role of random oxygen defects

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.

arXiv comment8 pages, 2 figures, submitted to J Supercond Novel Magnetism (ICSM12 conference contribution)

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Cited by in corpus (3)

• Emerging magnetism and electronic phase separation at titanate interfaces
• Mechanical dissipation from charge and spin transitions in oxygen deficient SrTiO_3
• Controlling the magnetism of oxygen surface vacancies in strontium titanate $(\mathrm{SrTi}{\mathrm{O}}_3)$ through charging