Thermodynamic properties of the planar $t-J$ model

Abstract

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 $T=T^{\ast }$, with $T^{\ast }$ decreasing with doping, and disappearing for $c_h>0.15$.

4 pages RevTeX, 5 Postscript figures

References in corpus (4)

• Correlated Electrons in High Temperature Superconductors
• Anomalous Spin Dynamics in Doped Quantum Antiferromagnets
• Validity of the rigid band picture for the t-J model
• Charge Dynamics in the Planar t-J Model

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