Drastic change of the electronic states at the quantum critical point in heavy fermions
| Autor: | Tetsuo Kubo, Hiroaki Shishido, Tatsuo C. Kobayashi, Yoshichika Ōnuki, Rikio Settai, Hisatomo Harima, Shingo Araki |
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| Rok vydání: | 2007 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Condensed matter physics Quantum oscillations Fermi surface Fermi energy Condensed Matter Physics Electronic Optical and Magnetic Materials Effective mass (solid-state physics) Condensed Matter::Strongly Correlated Electrons Fermi liquid theory Cooper pair Pseudogap Fermi gas |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 310:541-547 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2006.11.197 |
| Popis: | We studied the change of the Fermi surface properties in antiferromagnets CeIn 3 and CeRhIn 5 via the dHvA experiments under pressure. We found the abrupt change of the Fermi surface at the critical pressure P c , where the magnetic ordering state changes to the paramagnetic one. The change of the Fermi surface indicates that the 4f-electron character is changed from localized to itinerant in CeIn 3 and CeRhIn 5 at P c . Namely, the 4f-electron contributes to the volume of the Fermi surface above P c . Interestingly, the pressure-induced heavy fermion state with large effective mass was observed around P c , where the pressure-induced superconductivity appears. We also discuss the Fermi surface properties in the system without inversion symmetry in the crystal structure as in CePt 3 Si and CeTX 3 (T:Co, Ir, Rh, X:Si, Ge). The spin–orbit interaction due to the lack of inversion symmetry brings about a splitting of the Fermi surface, which is important for considering the formation of Cooper pair. |
| Databáze: | OpenAIRE |
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