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An explanation is provided for the heavy quasiparticle excitations in LiV 2 O 4 . It differs considerably from that of other known heavy-fermion systems. Main ingredients of our theory are the cubic spinel structure of the material and strong short-range correlations of the d electrons. The large γ coefficient is shown to result from excitations of Heisenberg spin ½ rings and chains. The required coupling constant is calculated from LDA+ U calculations and is found to be of the right size. Also the calculated Sommerfeld-Wilson ratio is reasonably close to the observed one.
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Fulde et al. (2001) studied this question.
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