Magnetically Ordered State at Correlated Oxide Interfaces: The Role of Random Oxygen Defects
| Autor: | Thilo Kopp, Natalia Pavlenko |
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| Rok vydání: | 2012 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Mesoscale and Nanoscale Physics Magnetic moment Hubbard model Condensed matter physics Magnetism Oxide Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Magnetization chemistry.chemical_compound chemistry Vacancy defect Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Coherent potential approximation Cuprate |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 26:1175-1178 |
| ISSN: | 1557-1947 1557-1939 |
| Popis: | 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) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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