Nearly critical ground state of LaCuO2.5

Details Nearly critical ground state of LaCuO2.5 Nearly critical ground state of LaCuO2.5

1996-06-13

arxiv.org/abs/cond-mat/9606089v2

Phys. Rev. B 55, R6117 (1997)

Physics

Condensed Matter

4 pages, RevTex, 2 figures. Revised version contains QMC data for larger lattices and a fit to experimental data

Scientific paper

10.1103/PhysRevB.55.R6117

Using a combination of analytical techniques and Quantum Monte Carlo simulations we investigate the coupled spin ladder system LaCuO2.5. At a critical ratio of the interladder to intraladder coupling (J'/J)_c \approx 0.11 we find a quantum phase transition between a Neel ordered and a disordered state. At criticality the uniform susceptibility behaves as \chi(T)=aT^2 with a universal prefactor. At intermediate temperatures the system crosses over to a ``decoupled ladders regime'' with pseudo-gap type behavior, similar to uncoupled ladders. This can explain the gap-like experimental data for the magnetic susceptibility of LaCuO2.5 despite the presence of the long range Neel order.

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