Title :
Tetrahedral magnetic cluster embedded in metallic matrix: electron-correlation effects
Author :
Cruz-Silva, E. ; Lopez-Urias, F. ; Munoz-Sandoval, E. ; Terrones, M.
Author_Institution :
Adv. Mater. Dept., IPICyT, San Luis Potosi, Mexico
Abstract :
A tetrahedral magnetic cluster surrounded by metallic atoms is studied in the framework of the Hubbard model. The ground-state energy and the wave function are obtained exactly using the Lanczos numerical diagonalization method. The spin/spin correlation functions γij=i·S&oarr;j> and the total spin S are analyzed as a function of the ratio between the on-site Coulomb repulsion U and electronic hopping t.
Keywords :
Hubbard model; electron correlations; ferromagnetism; Coulomb repulsion; Hubbard model; Lanczos numerical diagonalization; electron correlation effects; ground state energy; metallic matrix; tetrahedral magnetic cluster; wave function; Antiferromagnetic materials; Coatings; Eigenvalues and eigenfunctions; Electrons; Giant magnetoresistance; Inorganic materials; Magnetic analysis; Magnetic materials; Magnetic moments; Wave functions; Clusters; Hubbard Model; electronic correlation; magnetism;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.855218
