Ground-state structural transitions in small clusters within the effective temperature framework
Ground-state structural transitions in finite-sized systems are studied in the Hubbard model. We use the concept of an effective temperature γ that is directly related to the interactions among electrons. We have studied all the possible clusters, with nearest-neighbour hopping, for two, three and four sites. Furthermore, we have also analysed the octahedron and the seven-site Apollonian networks. We show that the clusters in which there is a ground-state phase transition are antiferromagnetically frustrated. The low temperature dependence for the specific heat and entropy allow us to infer that there is a V-shaped universal phase in finite clusters.
Volume (Year): 392 (2013)
Issue (Month): 3 ()
|Contact details of provider:|| Web page: http://www.journals.elsevier.com/physica-a-statistical-mechpplications/|
When requesting a correction, please mention this item's handle: RePEc:eee:phsmap:v:392:y:2013:i:3:p:444-450. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Zhang, Lei)
If references are entirely missing, you can add them using this form.