Spin-Orbital Fluctuations and a large mass enhancement in LiV_2O_4

Abstract

We present a scenario that the multi-component fluctuations, especially those of the spin-orbital coupled modes, lead to the mass enhancement observed in LiV_2O_4. This phenomena is possible because all these modes are fluctuating due to the geometrical frustration. To illustrate this mechanism, the t_{2g}-orbital Hubbard model on the pyrochlore lattice is studied based on the random-phase approximation. We derive the generalized susceptibility in the SU(6) spin-orbital space and calculate the free energy by using a coupling-constant integration. The estimated specific heat coefficient is of the correct order of magnitude to explain the experiment.

arXiv comment5 pages, 3 EPS figures

References in corpus (9)

• Heavy-fermion and spin-liquid behavior in a Kondo lattice with magnetic frustration
• The electronic structure of the heavy fermion metal $Li{V}_2{O}_4$
• Spin fluctuations in a magnetically frustrated metal, LiV2O4
• Electronic structure and magnetic interactions in LiV2O4
• Electronic structure of spinel-type LiV_2O_4
• On the origin of heavy quasiparticles in LiV_2O_4
• Mott transition and heavy fermion state in the pyrochlore Hubbard model
• Formation of heavy quasiparticle state in two-band Hubbard model
• Hubbard chains network on corner-sharing tetrahedra: origin of the heavy fermion state in LiV_2O_4

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