2003/09/11 by Pinaki Sengupta, Weihong Zheng, Rajiv R. P. Singh
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Coupling (piping) #Geology #Materials science #Mathematics #Monte Carlo method #Physics #Physics of Superconductivity and Magnetism #Quantum Monte Carlo #Series (stratigraphy) #Spin (aerodynamics) #Spins #Statistics #Theoretical and Computational Physics #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.69.064428
9 pages, 11 figs., 1 table
arxiv created 2003/09/11 · openalex publication_date 2004/02/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Motivated by the geometry of spins in the materials SrCu2O3 and CaCu2O3, we study a two-layer, spin-half Heisenberg model, with nearest-neighbor exchange couplings J and \ensuremathαJ along the two axes in the plane and a coupling J_\ensuremath⊥ perpendicular to the planes. We study these class of models using the stochastic series expansion quantum Monte Carlo simulations at finite temperatures and series expansion methods at T=0. The critical value of the interlayer coupling, J_\ensuremath⊥c, separating the N'eel ordered and disordered ground states, is found to follow very closely a square root dependence on \ensuremathα. Both T=0 and finite-temperature properties of the model are presented and the contrasting behavior of SrCu2O3 and CaCu2O3 are explained.