Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-18
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 13 figures, accepted for publication in Europhysics Journal B
Scientific paper
10.1140/epjb/e2010-00270-7
By using Density Matrix Renormalization Group (DMRG) technique we study the phase diagram of 1D extended anisotropic Heisenberg model with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions. We analyze the static correlation functions for the spin operators both in- and out-of-plane and classify the zero-temperature phases by the range of their correlations. On clusters of $64,100,200,300$ sites with open boundary conditions we isolate the boundary effects and make finite-size scaling of our results. Apart from the ferromagnetic phase, we identify two gapless spin-fluid phases and two ones with massive excitations. Based on our phase diagram and on estimates for the coupling constants known from literature, we classify the ground states of several edge-sharing materials.
Avella Adolfo
Mancini Ferdinando
Plekhanov Evgeny
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