Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-10-19
J. Phys. Soc. Jpn. 74 (2005) 200
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages, 6 figures, to be published in Special Invited Section (Kondo Effect) of Journal of Physical Society of Japan
Scientific paper
10.1143/JPSJ.74.200
Possible Kondo effect in Pr skutterudite is studied with attention to characteristic features of low-lying crystalline electric field (CEF) levels and the conduction band. A mechanism for the small CEF splitting between a singlet and a triplet is proposed as combination of the point-charge interaction and hybridization of 4f with ligand p states. Provided 4f^3 configurations dominate over 4f^1 as intermediate states, p-f hybridization favors the triplet, while point-charge interaction favors the singlet. For realistic parameters for hybridization as well as 4f^1 and 4f^3 levels, these singlet and triplet can form a nearly degenerate pseudo-quartet. It is found that one of two spin 1/2 objects composing the pseudo-quartet has a ferromagnetic exchange, while the other has an antiferromagnetic exchange with conduction electrons. The magnitude of each effective exchange depends strongly on a parameter characterizing the triplet wave function under the T_h symmetry. It is argued that differences of this parameter among Pr skutterdudites are responsible for the apparent diversity of their physical properties. Numerical renormalization group is used to derive the renormalization flows going toward singlet, doublet, triplet or quaret according to the CEF splitting and exchange interactions.
Kuramoto Yoshio
Kusunose Hiroaki
Otsuki Junya
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