On the origin of heavy quasiparticles in $\chem{LiV_2O_4}$

Author： Fulde P.   Yaresko A. N.   Zvyagin A. A.   Grin Y.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|54|6|779-785

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.54, Iss.6, 2010-03, pp. : 779-785

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Abstract

An explanation is provided for the heavy quasiparticle excitations inLiV2O4. It differs considerably from that of other known heavy-fermionsystems. Main ingredients of our theory are the cubic spinel structure of thematerial and strong short-range correlations of the d electrons. The largeγ coefficient is shown to result from excitations of Heisenberg spin$\frac{1}{2}$ rings and chains. The required coupling constant is calculatedfrom LDA+U calculations and is found to be of the right size. Also thecalculated Sommerfeld-Wilson ratio is reasonably close to the observed one.

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