Charge-order on the triangular lattice: Effects of next-nearest-neighbor attraction in finite temperatures
| dc.contributor.author | Konrad, Jerzy Kapcia | |
| dc.date.accessioned | 2021-11-04T12:02:13Z | |
| dc.date.available | 2021-11-04T12:02:13Z | |
| dc.date.issued | 2021-09-03 | |
| dc.description | This is the author created version of an article accepted for publication in J. Magn. Magn. Matter (Elsevier) journal. The article has been published on a gold open access basis under a CC BY 4.0 licence | pl |
| dc.description.abstract | The extended Hubbard model in the atomic limit, which is equivalent to lattice S=1/2 fermionic gas, is considered on the triangular lattice. The model includes onsite Hubbard U interaction and both nearest-neighbor (W1) and next-nearest-neighbor (W2) density-density intersite interactions. The variational approach treating the $U$ term exactly and the $W_l$ terms in the mean-field approximation is used to investigate thermodynamics of the model and to find its finite temperature (T>0) phase diagrams (as a function of particle concentration) for W1>0 and W2<0. Two different types of charge-order (i.e., DCO and TCO phases) within $\sqrt{3} \times \sqrt{3}$ unit cells as well as the nonordered (NO) phase occur on the diagram. Moreover, several kinds of phase-separated (PS) states (NO/DCO, DCO/DCO, DCO/TCO, and TCO/TCO) are found to be stable for fixed concentration. Attractive W2}<0 stabilizes PS states at T=0 and it extends the regions of their occurrence at T>0. The evolution of the diagrams with increasing of |W2|/W1 is investigated. It is found that some of the PS states are stable only at T>0. Two different critical values of |W2|/W1 are determined for the PS states, in which two ordered phases of the same type (i.e., two domains of the DCO or TCO phase) coexist. | pl |
| dc.description.sponsorship | National Science Centre (NCN, Poland) - Grant SONATINA 1 no. UMO-2017/24/C/ST3/00276; scholarship of the Minister of Science and Higher Education (Poland) for outstanding young scientists (2019 edition, no. 821/STYP/14/2019) | pl |
| dc.identifier.citation | Journal of Magnetism and Magnetic Materials 541, 168441 (2022) | pl |
| dc.identifier.doi | https://doi.org/10.1016/j.jmmm.2021.168441 | |
| dc.identifier.issn | 0304-8853 | |
| dc.identifier.uri | https://hdl.handle.net/10593/26462 | |
| dc.language.iso | eng | pl |
| dc.publisher | Elsevier | pl |
| dc.rights | info:eu-repo/semantics/openAccess | pl |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/pl/ | * |
| dc.subject | charge order | pl |
| dc.subject | triangular lattice | pl |
| dc.subject | fermionic lattice gas | pl |
| dc.subject | longer-range interactions | pl |
| dc.subject | extended Hubbard model | pl |
| dc.subject | atomic limit | pl |
| dc.title | Charge-order on the triangular lattice: Effects of next-nearest-neighbor attraction in finite temperatures | pl |
| dc.type | Artykuł | pl |
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