Thermodynamic properties of the planar $t-J$ model

Details Thermodynamic properties of the planar $t-J$ model Thermodynamic properties of the planar $t-J$ model

1996-03-12

arxiv.org/abs/cond-mat/9603081v1

Phys. Rev. Lett. 77, 892 (1996)

Physics

Condensed Matter

4 pages RevTeX, 5 Postscript figures

Scientific paper

10.1103/PhysRevLett.77.892

Several thermodynamic quantities within the planar $t-J$ model are calculated using the $T>0$ Lanczos method on clusters of up to 26 sites. Hole density $c_h(\mu,T)$ shows a non-Fermi liquid behavior as a function of $T$ and suggests a transition from small to large Fermi surface at $c_h\sim 0.15$. Specific heat reveals a maximum at the exchange energy-scale up to $c_h=0.2$, where it becomes almost $T$-independent for $T\agt 0.15~t$. At constant $T$ the entropy has maximum for $c_h\sim 0.15$, with large values at low $T$, consistent with experiments on cuprates. In the underdoped regime the spin susceptibility $\chi_0(T)$ exhibits a maximum at finite $T = T^*$, with $T^*$ decreasing with doping, and disappearing for $c_h>0.15$.

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