Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi
Based on the known phenomenology of high-Tc cuprates and the available numerical calculations of the t − J model, a two-dimensional effective fermionic model with the nearest neighbor attraction is proposed. Numerical calculations suggest that the model has the dx2−y2 superconductivity (SC)...
Gespeichert in:
| Datum: | 2018 |
|---|---|
| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Publishing house "Academperiodika"
2018
|
| Online Zugang: | https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018474 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Назва журналу: | Ukrainian Journal of Physics |
Institution
Ukrainian Journal of Physics| id |
ujp2-article-2018474 |
|---|---|
| record_format |
ojs |
| spelling |
ujp2-article-20184742019-03-29T09:32:44Z A Model for dx2−y2 Superconductivity in the Strongly Correlated Fermionic System Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi Bariakhtar, I. Nazarenko, A. superconductivity strongly correlated fermionic system t − J model mean-field approximation Based on the known phenomenology of high-Tc cuprates and the available numerical calculations of the t − J model, a two-dimensional effective fermionic model with the nearest neighbor attraction is proposed. Numerical calculations suggest that the model has the dx2−y2 superconductivity (SC) in the ground state at a low fermionic density. We argue that this model captures the important physics of the dx2−y2 superconducting correlations found earlier in the t − J model by the exact diagonalization approach. Within a self-consistent RPA diagrammatic study, the density and the coupling strength dependence of the critical temperature is calculated. We also investigate the influence of the impurities on our results and show that the suppression of the superconductivity is insignificant, when the retardation effects are accounted for as opposed to the Hartree–Fock approximation. Пропонується двовимiрна ефективна фермiоннa модель з притяганням до найближчих сусiдiв, що ґрунтується на вiдомiй феноменологiї ВТНП i iснуючих чисельних розрахунках у моделi t − J. Чисельнi розрахунки показують, що модель має dx2−y2 ) надпровiднiсть в основному станi при низьких фермiонних концентрацiях. Ми стверджуємо, що ця модель вiдображає важливу фiзику dx2−y2 надпровiдних кореляцiй, знайдених ранiше в t − J моделi в пiдходi точної дiагоналiзацiї. У рамках самоузгодженого наближення хаотичних фаз обчислено залежностi критичної температури вiд концентрацiї i константи зв’язку. Дослiджується також вплив домiшок на нашi результати i показано, що при облiку ефектiв запiзнювання зниження надпровiдностi незначне, на вiдмiну вiд наближення Хартрi–Фока. Publishing house "Academperiodika" 2018-10-23 Article Article Peer-reviewed Рецензована стаття application/pdf https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018474 10.15407/ujpe59.05.0487 Ukrainian Journal of Physics; Vol. 59 No. 5 (2014); 487 Український фізичний журнал; Том 59 № 5 (2014); 487 2071-0194 2071-0186 10.15407/ujpe59.05 en https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018474/484 Copyright (c) 2018 Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine |
| institution |
Ukrainian Journal of Physics |
| baseUrl_str |
|
| datestamp_date |
2019-03-29T09:32:44Z |
| collection |
OJS |
| language |
English |
| topic_facet |
superconductivity strongly correlated fermionic system t − J model mean-field approximation |
| format |
Article |
| author |
Bariakhtar, I. Nazarenko, A. |
| spellingShingle |
Bariakhtar, I. Nazarenko, A. Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| author_facet |
Bariakhtar, I. Nazarenko, A. |
| author_sort |
Bariakhtar, I. |
| title |
Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| title_short |
Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| title_full |
Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| title_fullStr |
Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| title_full_unstemmed |
Модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| title_sort |
модель для dx2−y2 надпровiдностi в сильнокорельованiй фермiоннiй системi |
| title_alt |
A Model for dx2−y2 Superconductivity in the Strongly Correlated Fermionic System |
| description |
Based on the known phenomenology of high-Tc cuprates and the available numerical calculations of the t − J model, a two-dimensional effective fermionic model with the nearest neighbor attraction is proposed. Numerical calculations suggest that the model has the dx2−y2 superconductivity (SC) in the ground state at a low fermionic density. We argue that this model captures the important physics of the dx2−y2 superconducting correlations found earlier in the t − J model by the exact diagonalization approach. Within a self-consistent RPA diagrammatic study, the density and the coupling strength dependence of the critical temperature is calculated. We also investigate the influence of the impurities on our results and show that the suppression of the superconductivity is insignificant, when the retardation effects are accounted for as opposed to the Hartree–Fock approximation. |
| publisher |
Publishing house "Academperiodika" |
| publishDate |
2018 |
| url |
https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018474 |
| work_keys_str_mv |
AT bariakhtari amodelfordx2y2superconductivityinthestronglycorrelatedfermionicsystem AT nazarenkoa amodelfordx2y2superconductivityinthestronglycorrelatedfermionicsystem AT bariakhtari modelʹdlâdx2y2nadprovidnostivsilʹnokorelʹovanijfermionnijsistemi AT nazarenkoa modelʹdlâdx2y2nadprovidnostivsilʹnokorelʹovanijfermionnijsistemi AT bariakhtari modelfordx2y2superconductivityinthestronglycorrelatedfermionicsystem AT nazarenkoa modelfordx2y2superconductivityinthestronglycorrelatedfermionicsystem |
| first_indexed |
2025-10-02T01:14:50Z |
| last_indexed |
2025-10-02T01:14:50Z |
| _version_ |
1851765098741235712 |