https://doi.org/10.1140/epjb/e2003-00113-8
Phase diagram of the spin S = 1/2 extended XY model
Andronikashvili Institute of Physics, Georgian Academy of Sciences
Tamarashvili str. 6, 380077, Tbilisi, Georgia
Corresponding author: a japa@iph.hepi.edu.ge
Received:
29
November
2002
Revised:
24
February
2003
Published online:
11
April
2003
The quantum phase transition in the ground state of the extended spin S=1/2 XY model has been studied in detail. Using the exact solution of the model the low temperature thermodynamics, as well as the ground state phase diagram of the model in the presence of applied uniform and/or staggered magnetic field are discussed.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.10.Jm – Quantized spin models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
