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Author | Nikolaev, A.V.; Michel, K.H. | ||||
Title | Elusive s-f intrasite interactions and double exchange in solids: ferromagnetic versus nonmagnetic ground state | Type | A1 Journal article | ||
Year | 2009 | Publication | Journal of experimental and theoretical physics | Abbreviated Journal | J Exp Theor Phys+ |
Volume | 109 | Issue | 2 | Pages | 286-292 |
Keywords | A1 Journal article; Condensed Matter Theory (CMT) | ||||
Abstract | From the theory of many-electron states in atoms, we know that there exists a strong Coulomb repulsion, which results in the electronic term structure of atoms and is responsible for Hunds rules. By expanding the Coulomb on-site repulsion into a multipolar series, we derive this interaction and show that it is also present in solids as a correlation effect, which means that the interaction requires a multideterminant version of the Hartree-Fock method. Of particular interest is the case where this interaction couples states of localized ( f) and delocalized ( s) electrons. We show that the interaction is bilinear in the creation/annihilation operators for localized electrons and bilinear in the operators for conduction electrons. To study the coupling, we consider a simple model in the framework of an effective limited configuration interaction method with one localized f-electron and one itinerant s-electron per crystal site. The on-site multipole interaction between the f- and s-electrons is explicitly taken into account. It is shown that depending on the low-lying excitation spectrum imposed by the crystal electric field, the model can lead not only to ferromagnetism but also to a nonmagnetic state. The model is relevant for solids with localized and itinerant electron states. | ||||
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Corporate Author | Thesis | ||||
Publisher | Place of Publication | Woodbury, N.Y. | Editor | ||
Language | Wos | 000270506500014 | Publication Date | 2009-09-18 | |
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1063-7761;1090-6509; | ISBN | Additional Links | UA library record; WoS full record; WoS citing articles | |
Impact Factor | 1.196 | Times cited | 3 | Open Access | |
Notes | Approved | Most recent IF: 1.196; 2009 IF: 0.871 | |||
Call Number | UA @ lucian @ c:irua:79163 | Serial | 1027 | ||
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