Electronic structure of the "heavy-fermion" systems LiV2O4

We have studied the electronic structure of LiV2O4 by photoemission spectro scopy and first-principles band-structure calculation. The spectra of LiV2O 4 show clear temperature dependence between 30 and 60 K in the vicinity of the Fermi level (E-F), which may indicate he quasi-particle density of stai rs increases below the "Kondo temperature" of similar to 30 K. The calculat ed band structure shows that the conduction electrons originate solely from the t(2g) complex of V 3d bands, which suggests that the mechanism for the mass enhancement in this system is different from that in the 4f heavy-fer mion systems. (C) 2000 Elsevier Science B.V. All rights reserved.