Magnetic phase diagram of an extended Hubbard model at half filling: Possible application for strongly correlated iron pnictides

详细信息    查看全文

• 作者：Tie-Jun Li ; Ya-Min Quan ; Da-Yong Liu ; Liang-Jian Zou ; ^{zou@theory.issp.ac.cn}
• 关键词：Hubbard model ; Slave boson ; Magnetism ; Spin frustration
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：324
• 期：6
• 页码：1046-1050
• 全文大小：415 K

文摘

We study the magnetic phase diagram within an extended half-filled Hubbard model, focusing on the roles of the next-nearest-neighbor (NNN) and the next-next-nearest-neighbor (3rd NN) hoppings in the magnetic configurations. We find that due to the spin frustration from the long range hopping and the competition between long-range hopping and Coulomb correlation, the striped antiferromagnetic (AFM) phase is stable when the NNN hopping is dominant, while the bicollinear AFM phase is robust when the 3rd NN hopping is considerably large. The triple points are found in various magnetic phase diagrams. Possible applications of the present theory on intermediately correlated LaFeAsO and strongly correlated FeTe are discussed.