2016年7月
Slater to Mott Crossover in the Metal to Insulator Transition of Nd2Ir2O7
PHYSICAL REVIEW LETTERS
- 巻
- 117
- 号
- 5
- 開始ページ
- 056403
- 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/PhysRevLett.117.056403
- 出版者・発行元
- AMER PHYSICAL SOC
We present an angle-resolved photoemission study of the electronic structure of the three-dimensional pyrochlore iridate Nd2Ir2O7 through its magnetic metal-insulator transition. Our data reveal that metallic Nd2Ir2O7 has a quadratic band, touching the Fermi level at the G point, similar to that of Pr2Ir2O7. The Fermi node state is, therefore, a common feature of the metallic phase of the pyrochlore iridates. Upon cooling below the transition temperature, this compound exhibits a gap opening with an energy shift of quasiparticle peaks like a band gap insulator. The quasiparticle peaks are strongly suppressed, however, with further decrease of temperature, and eventually vanish at the lowest temperature, leaving a nondispersive flat band lacking long-lived electrons. We thereby identify a remarkable crossover from Slater to Mott insulators with decreasing temperature. These observations explain the puzzling absence of Weyl points in this material, despite its proximity to the zero temperature metal-insulator transition.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevLett.117.056403
- ISSN : 0031-9007
- eISSN : 1079-7114
- Web of Science ID : WOS:000381470200009