Critical behaviour of the ferromagnetic Ising model on a triangular lattice  

作　　者：罗志环 Loan Mushtaq 刘岩 林健荣 

机构地区：[1]Department of Applied Physics,South China Agricultural University [2]Department of Physics,Sun Yet-Sen University [3]International School,Jinan University [4]Engineering College,South China Agricultural University

出　　处：《Chinese Physics B》2009年第7期2696-2702,共7页中国物理B（英文版）

基　　金：Project supported partially by Guangdong Natural Science Foundation (GDNSF) of China (Grant No 07300793);One of authors(Loan Mushtaq) was partially supported by the Guangdong Ministry of Education,China

摘　　要：We use a new updated algorithm scheme to investigate the critical behaviour of the two-dimensional ferromagnetic Ising model on a triangular lattice with the nearest neighbour interactions. The transition is examined by generating accurate data for lattices with L=8, 10, 12, 15, 20, 25, 30, 40 and 50. The updated spin algorithm we employ has the advantages of both a Metropolis algorithm and a single-update method. Our study indicates that the transition is continuous at Тc=3.6403（2）. A convincing finite-size scaling analysis of the model yields ν=0.9995（21）, β/ν=0.12400（17）, γ/v=1.75223（22）, γ^1/ν=1.7555（22）, α/ν=0.00077（420） （scaling） and α/ν=0.0010（42） （hyperscaling）. The present scheme yields more accurate estimates for all the critical exponents than the Monte Carlo method, and our estimates are shown to be in excellent agreement with their predicted values.We use a new updated algorithm scheme to investigate the critical behaviour of the two-dimensional ferromagnetic Ising model on a triangular lattice with the nearest neighbour interactions. The transition is examined by generating accurate data for lattices with L=8, 10, 12, 15, 20, 25, 30, 40 and 50. The updated spin algorithm we employ has the advantages of both a Metropolis algorithm and a single-update method. Our study indicates that the transition is continuous at Тc=3.6403（2）. A convincing finite-size scaling analysis of the model yields ν=0.9995（21）, β/ν=0.12400（17）, γ/v=1.75223（22）, γ^1/ν=1.7555（22）, α/ν=0.00077（420） （scaling） and α/ν=0.0010（42） （hyperscaling）. The present scheme yields more accurate estimates for all the critical exponents than the Monte Carlo method, and our estimates are shown to be in excellent agreement with their predicted values.

关 键 词：Ising model triangular lattice Monte Carlo method 

分 类 号：O469[理学—凝聚态物理]