Thermodynamic and diamagnetic properties of weakly doped antiferromagnets

Details Thermodynamic and diamagnetic properties of weakly doped antiferromagnets Thermodynamic and diamagnetic properties of weakly doped antiferromagnets

2000-02-15

arxiv.org/abs/cond-mat/0002220v2

Phys. Rev. B 62, 6745 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

LaTeX, 10 pages, 10 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.6745

Finite-temperature properties of weakly doped antiferromagnets as modeled by the two-dimensional t-J model and relevant to underdoped cuprates are investigated by numerical studies of small model systems at low doping. Two numerical methods are used: the worldline quantum Monte Carlo method with a loop cluster algorithm and the finite-temperature Lanczos method, yielding consistent results. Thermodynamic quantities: specific heat, entropy and spin susceptibility reveal a sizeable perturbation induced by holes introduced into a magnetic insulator, as well as a pronounced temperature dependence. The diamagnetic susceptibility introduced by coupling of the magnetic field to the orbital current reveals an anomalous temperature dependence, changing character from diamagnetic to paramagnetic at intermediate temperatures.

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