%0 Journal Article
%T A NEW APPROACH TO INVESTIGATING THE VALENCE FLUCTUATION COMPOUNDS<br>研究价涨落化合物的一种新方法
%A ZHENG HANG
%A <br>郑杭
%J 物理学报
%D 1987
%I 
%X The ground state properties of the Sm-based valence fluctuation compounds are discussed by introducing an indirect on-site hybridization mediated by phonons, as the direct on-site hybridization is forbidden by inversion symmetry. The Hamihonian including this indirect hybridization is transformed into an effective Hamihonian of a "small polaron" type by means of a. canonical transformation. A self-consistent field approximation is used, a non-zero energy gap and the noninteger occupation of the f level have been given. The results obtained can be used to explain the small energy gap and the valence fluctuation phenomena observed in SmB6 and SmS.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=C0187A96495C4B42CD83DF6AC2D89618&yid=9C2DB0A0D5ABE6F8&vid=933658645952ED9F&iid=DF92D298D3FF1E6E&sid=CC5564FFEBD22614&eid=E23857687CD2EE51&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=0