| Autor: |
Nunes, Lizardo H. C. M., Figueira, M. S., Foglio, M. E. |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Physics Letters A 358 (2006) 313-321 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.physleta.2006.05.025 |
| Popis: |
In this Letter we study the periodic Anderson model, employing both the slave-boson and the X-boson approaches in the mean field approximation. We investigate the breakdown of the slave-boson at intermediate temperatures when the total occupation number of particles Nt = Nf + Nc is keep constant, where Nf and Nc are respectively the occupation numbers of the localized and conduction electrons, and we show that the high-temperature limit of the slave-boson is Nf = Nc = Nt /2. We also compare the results of the two approaches in the Kondo limit and we show that at low-temperatures the X-boson exhibits a phase transition, from the Kondo heavy fermion (K-HF) regime to a local moment magnetic regime (LMM). |
| Databáze: |
arXiv |
| Externí odkaz: |
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