1996/06/30 by Matthias Troyer, M. E. Zhitomirsky, Kazuo Ueda · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat
paper · pdf · doi:10.1103/physrevb.55.r6117
published as Phys. Rev. B 55, R6117 (1997) · 4 pages, RevTex, 2 figures. Revised version contains QMC data for larger lattices and a fit to experimental data
arxiv created 1996/09/13 · openalex publication_date 1997/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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|IH/J)c\ensuremath≈0.11 we find a quantum phase transition between a N'eel ordered and a disordered state. At criticality the uniform susceptibility behaves as \ensuremathχ(T)=aT2 with a universal prefactor. At intermediate temperatures the system crosses over to a ``decoupled ladders regime'' with pseudogap-type behavior, similar to uncoupled ladders. This can explain the gaplike experimental data for the magnetic susceptibility of LaCuO2.5 despite the presence of long-range N'eel order.