Phys. Rev. B 49, 16048–16051 (1994)Effect of the Cu-Cu superexchange on the stability of Zhang-Rice singletsReceived 10 December 1993; published in the issue dated 1 June 1994 We solve exactly a Cu4O8 cluster with four and five holes, for parameters for which the low-energy physics of the three-band Hubbard model can be mapped exactly to a t-J model with J=0. When a Cu-Cu superexchange J is included, the mapping is no more exact. We investigate the quality of the mapping and the amount of nonorthogonal Zhang-Rice singlets of each low-energy eigenstate as a function of J. We also explain briefly how to calculate a property of the three-band model (such as the Cu and O photoemission intensity) using the t-J model. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.49.16048
DOI:
10.1103/PhysRevB.49.16048
PACS:
71.10.+x, 74.72.-h, 75.10.Jm
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.