A Single-Site Picture of Valence Fluctuation in Periodic Anderson Hamiltonian with Large Coulomb Correlation

概要

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It is discussed that a competition between a formation of the singlet boundstate at each site and an exchange interaction plays an important role in a peri-odic Anderson Hamiltonian with large Coulomb correlation. As the depth of flevels measured from the chemical potential is shallower, each f level site is morelikely to behave independently; the depth is related with the number of f electronsper site (nj). Therefore the system can be classified into three regimes: i) The6rst one is the independent f level regime where nj is significantly less than one.ii) In the crossover regime where nj is nearly one, each f level site behaves inde-pendently at high temperatures. However a band-like coherent behavior, ormagnetic orderings are expected at low temperatures. iii) In the RKKY regimewhere nj is x'ery nearly one, magnetic orderings are expected at low temperatures.
社団法人日本物理学会の論文
1983-11-15