Finite temperature properties of the triangular lattice t-J model, applications to Na$_x$CoO$_2$

Details Finite temperature properties of the triangular lattice t-J model, applications to Na$_x$CoO$_2$ Finite temperature properties of the triangular lattice t-J model, applications to Na$_x$CoO$_2$

2006-07-31

arxiv.org/abs/cond-mat/0608005v1

Phys. Rev. B 74, 245118 (2006) (12 pages)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.74.245118

We present a finite temperature ($T$) study of the t-J model on the two-dimensional triangular lattice for the negative hopping $t$, as relevant for the electron-doped Na$_x$CoO$_2$ (NCO). To understand several aspects of this system, we study the $T$-dependent chemical potential, specific heat, magnetic susceptibility, and the dynamic Hall-coefficient across the entire doping range. We show systematically, how this simplest model for strongly correlated electrons describes a crossover as function of doping ($x$) from a Pauli-like weakly spin-correlated metal close to the band-limit (density $n=2$) to the Curie-Weiss metallic phase ($1.5

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