Finite temperature properties of the 2D Hubbard model extended by next-nearest-neighbor hopping interaction

被引：0
作者：
S Nath
N K Ghosh
机构：
[1] University of Kalyani,Department of Physics
来源：
Indian Journal of Physics | 2012年 / 86卷
关键词：
Hubbard model; Hopping interaction; Thermodynamic properties; 71.10.Fd; 05.30.Fk; 71.27.+a;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
We present an exact diagonalization study on a two dimensional Hubbard model extended by next-nearest-neighbor (NNN) hopping for a small cluster. The thermodynamic properties of spin–spin correlation, local moment, double occupancy, entropy, specific heat are studied for different U and NNN hopping interactions (t′). The increase of NNN hopping interaction favors the formation of doublans and hence decreases local moment in the low temperature region. Transition temperature (Tc) region is identified from entropy curves. Characteristic double peak structure is observed in the specific heat curves with the inclusion of NNN hopping interaction.
引用
收藏
页码：351 / 356
页数：5
相关论文
共 93 条
[1]  
Bednorz J G(1986)undefined Z. Phys. B 64 189-undefined
[2]  
Müller K A(1963)undefined Proc. Roy. Soc. Lond. A 276 238-undefined
[3]  
Hubbard J(1987)undefined Science 235 1196-undefined
[4]  
Anderson P W(2003)undefined Phys. Rev. Lett. 91 136403-undefined
[5]  
White S R(1994)undefined Rev. Mod. Phys. 66 763-undefined
[6]  
Scalapino D J(2002)undefined Adv. Phys. 51 1587-undefined
[7]  
Dagotto E(2005)undefined Rev. Mod. Phys. 77 1027-undefined
[8]  
Bulut N(2010)undefined Pramana 74 115-undefined
[9]  
Maier T A(2000)undefined Phys. Rev. B 61 R16287-undefined
[10]  
Jarrell M(2000)undefined Phys. Rev. B 62 R6112-undefined
12345678910