2013年
Ferromagnetism and Fermi surface transition in the periodic Anderson model: Second-order phase transition without symmetry breaking
Physical Review B
- 巻
- 87
- 号
- 19
- 開始ページ
- 195127
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.87.195127
- 出版者・発行元
- AMER PHYSICAL SOC
We study ferromagnetism in the periodic Anderson model with and without a magnetic field by the Gutzwiller theory. We find three ferromagnetic phases: a weak ferromagnetic phase (FM0), a half-metallic phase without Fermi surface for the majority spin (FM1), and a ferromagnetic phase with almost completely polarized f electrons (FM2). The Fermi surface changes from the large Fermi surface in the paramagnetic state to the small Fermi surface in FM2. We also find that the transitions between the ferromagnetic phases can be second-order phase transitions in spite of the absence of symmetry breaking. While we cannot define an order parameter for such transitions in an ordinary way, the topology of the Fermi surface characterizes the transitions, i.e., they are Lifshitz transitions.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevB.87.195127
- ISSN : 1098-0121
- ORCIDのPut Code : 41847469
- Web of Science ID : WOS:000319281300002