Cluster dynamical mean-field study of the Hubbard model on a 3D frustrated hyperkagome lattice - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: We study the Hubbard model on a geometrically-frustrated hyperkagome latticeby a cluster extension of the dynamical mean field theory. We calculate thetemperature $T$ dependences of the specific heat $C$ and the spin-latticerelaxation time $T 1$ in correlated metallic region. $C-T$ shows a peak at$T=T {p1}$ and rapidly decreases as $T->0$. On the other hand, $1-T 1T$ has apeak at a higher temperature $T {p2}$ than $T {p1}$, and largely decreasesbelow $T {p2}$, followed by the Korringa law $1-T 1 propto T$ as $T->0$. Bothpeak temperatures are suppressed and the peaks become sharper as electroncorrelation is increased. These behaviors originate from strong renormalizationof the energy scales in the peculiar electronic structure in this frustratedsystem; a pseudo-gap like feature, the van-Hove singularity, and the flat band.The results are discussed in comparison with the experimental data in thehyperkagome material, Na$ 4$Ir$ 3$O$ 8$.



Autor: Masafumi Udagawa, Yukitoshi Motome

Fuente: https://arxiv.org/







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