Spin-orbital fluctuations and a large mass enhancement in LiV2O4

Article

关键词: ELECTRONIC-STRUCTURE;    FERMI-LIQUID;    TRANSITION;    BEHAVIOR;    STATE;   

DOI  :  10.1103/PhysRevB.67.195107

来源: SCIE

【 摘 要 】

We present a scenario that the multicomponent fluctuations, especially those of the spin-orbital coupled modes, lead to the mass enhancement observed in LiV2O4. This phenomenon 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.

【 授权许可】

Free