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Nearly critical ground state of LaCuO2.5

Matthias Troyer·M. E. Zhitomirsky·Kazuo Ueda
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Abstract

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 χ(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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Matthias Troyer, M. E. Zhitomirsky, Kazuo Ueda. 1996-09-13. Nearly critical ground state of LaCuO2.5. https://doi.org/10.1103/physrevb.55.r6117

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