Some properties of the model of a superconductor with pair hopping and magnetic interactions at half-filling
| dc.contributor.author | Kapcia, Konrad | |
| dc.date.accessioned | 2013-09-02T06:59:28Z | |
| dc.date.available | 2013-09-02T06:59:28Z | |
| dc.date.issued | 2012-04 | |
| dc.description | This is an author-created, un-copyedited version of an article accepted for publication in Acta Physica Polonica A. The Version of Record is available online at http://przyrbwn.icm.edu.pl/APP/PDF/121/a121z4p104.pdf | pl_PL |
| dc.description.abstract | We present our preliminary studies of an effective model of a superconductor with short coherence length involving magnetic interactions. The Hamiltonian considered consists of (i) the effective on-site interaction U, (ii) the intersite magnetic exchange interactions (Jz, Jxy) between nearest-neighbors and (iii) the intersite charge exchange term I, determining the hopping of electron pairs between nearest-neighbor sites. In the analysis of the phase diagrams and thermodynamic properties of this model for half-filling (n=1) we have adopted the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation. One finds that the system considered can exhibit very interesting multicritical behaviors (including tricritical, critical-end and bicritical points) caused by the competition between magnetism and superconductivity, even for n=1. Our investigations show that, depending on the values of interaction parameters, the system at half-filling can exhibit three homogeneous phases: superconducting (SS), (anti-)ferromagnetic (F) and nonordered (NO). The transitions between ordered phases (SS, F) and the NO phase can be first order as well as second order ones, whereas SS-F transition is first order one. Temperature dependencies of the order parameters and thermodynamic properties of the system at the sequence of transitions: SS-F-NO with increasing temperature for J/I=0.3, U/I0 = 0.69 and n=1 are also presented. | pl_PL |
| dc.description.sponsorship | National Science Center (NCN) as a research project in years 2011-2013, under grant No. DEC-2011/01/N/ST3/00413; European Commission and Ministry of Science and Higher Education (Poland) - partial financial support from European Social Fund – Operational Programme “Human Capital” – POKL.04.01.01-00-133/09-00 – "Proinnowacyjne kształcenie, kompetentna kadra, absolwenci przyszłości". | pl_PL |
| dc.identifier.citation | Acta Physica Polonica A, Vol. 121, No. 4, 733-737 (2012) | pl_PL |
| dc.identifier.issn | 0587-4246 | |
| dc.identifier.uri | http://hdl.handle.net/10593/7697 | |
| dc.language.iso | en | pl_PL |
| dc.publisher | Polish Academy of Sciences, Institute of Physics, al. Lotników 32-46, Pl-02-668 Warsaw, Poland | pl_PL |
| dc.subject | magnetic orderings | pl_PL |
| dc.subject | superconductivity | pl_PL |
| dc.subject | extended Hubbard model | pl_PL |
| dc.subject | atomic limit | pl_PL |
| dc.subject | phase separation | pl_PL |
| dc.title | Some properties of the model of a superconductor with pair hopping and magnetic interactions at half-filling | pl_PL |
| dc.type | Artykuł | pl_PL |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- Kapcia_K-Some properties of the model of a superconductor with pair hopping and magnetic interactions at half-filling-2012.pdf
- Size:
- 537.96 KB
- Format:
- Adobe Portable Document Format
License bundle
1 - 1 of 1
No Thumbnail Available
- Name:
- license.txt
- Size:
- 1.49 KB
- Format:
- Item-specific license agreed upon to submission
- Description: