Effect of atomic disorder on the magnetic phase separation
| Autor: | A G Groshev, A. K. Arzhnikov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics Hubbard model Separation (statistics) Allowance (engineering) 02 engineering and technology Electron 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Impurity 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons General Materials Science Functional integration 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Journal of Physics: Condensed Matter. 30:185801 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/1361-648x/aaba09 |
| Popis: | The effect of disorder on the magnetic phase separation between the antiferromagnetic and incommensurate helical [Formula: see text] and [Formula: see text] phases is investigated. The study is based on the quasi-two-dimensional single-band Hubbard model in the presence of atomic disorder (the [Formula: see text] Anderson-Hubbard model). A model of binary alloy disorder is considered, in which the disorder is determined by the difference in energy between the host and impurity atomic levels at a fixed impurity concentration. The problem is solved within the theory of functional integration in static approximation. Magnetic phase diagrams are obtained as functions of the temperature, the number of electrons and impurity concentration with allowance for phase separation. It is shown that for the model parameters chosen, the disorder caused by impurities whose atomic-level energy is greater than that of the host atomic levels, leads to qualitative changes in the phase diagram of the impurity-free system. In the opposite case, only quantitative changes occur. The peculiarities of the effect of disorder on the phase separation regions of the quasi-two-dimensional Hubbard model are discussed. |
| Databáze: | OpenAIRE |
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