2000年5月
Quantum phase transitions in the Shastry-Sutherland model for SrCu2(BO3)(2)
PHYSICAL REVIEW LETTERS
- ,
- 巻
- 84
- 号
- 19
- 開始ページ
- 4461
- 終了ページ
- 4464
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.84.4461
- 出版者・発行元
- AMERICAN PHYSICAL SOC
We investigate quantum phase transitions in the frustrated antiferromagnetic Heisenberg model for SrCu2(BO3)(2) by using the series expansion method. It is found that a novel spin-gap phase, adiabatically connected to the plaquette-singlet phase, exists between the dimer and the magnetically ordered phases known thus far. When the ratio of the competing exchange couplings alpha(= J'/J) is varied, this spin-gap phase exhibits a first- (second-) order quantum phase transition to the dimer (the magnetically ordered) phase at the critical point alpha(c1) = 0.677(2) [alpha(c2) = 0.86(1)]. Our results shed light on some controversial arguments about the nature of quantum phase transitions in this model.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevLett.84.4461
- ISSN : 0031-9007
- Web of Science ID : WOS:000086941600052