Publication
Magnetic and superconducting instabilities in the periodic Anderson model: a random-phase-approximation study
| Summary: | We study the magnetic and superconducting instabilities of the periodic Anderson model with infinite Coulomb repulsion U in the random-phase approximation. The Neel temperature and the superconducting critical temperature are obtained as functions of electronic density (chemical pressure) and hybridization V (pressure). It is found that close to the region where the system exhibits magnetic order the critical temperature T-c is much smaller than the Neel temperature, in qualitative agreement with some T-N/T-c ratios found for some heavy-fermion materials. In our study, the magnetic and superconducting physical behaviour of the system has its origin in the fluctuating boson fields effecting the infinite on-site Coulomb repulsion among the f electrons. |
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| Main Authors: | Peres, Nuno |
| Other Authors: | Araújo, Miguel |
| Subject: | supercondutividade rede de Anderson magnetismo |
| Year: | 2020 |
| Country: | Portugal |
| Document type: | article |
| Access type: | restricted access |
| Associated institution: | Universidade de Évora |
| Language: | English |
| Origin: | Repositório Científico da Universidade de Évora |
| Summary: | We study the magnetic and superconducting instabilities of the periodic Anderson model with infinite Coulomb repulsion U in the random-phase approximation. The Neel temperature and the superconducting critical temperature are obtained as functions of electronic density (chemical pressure) and hybridization V (pressure). It is found that close to the region where the system exhibits magnetic order the critical temperature T-c is much smaller than the Neel temperature, in qualitative agreement with some T-N/T-c ratios found for some heavy-fermion materials. In our study, the magnetic and superconducting physical behaviour of the system has its origin in the fluctuating boson fields effecting the infinite on-site Coulomb repulsion among the f electrons. |
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