First-order commensurate-incommensurate magnetic phase transition in the coupled FM spin-1/2 two-leg ladders
Abstract
We consider the spin-1/2 two-leg ladders with ferromagnetic (FM) interactions along legs and rungs. Using the stochastic series expansion QMC method, we study the low-temperature magnetic behavior of the system. An isolated spin-1/2 FM two-leg ladder is in the gapped saturated FM phase at zero temperature. As soon as the spin-1/2 FM two-leg ladders are connected with antiferromagnetic (AFM) inter-ladder interaction, a first-order commensurate-incommensurate quantum phase transition occurs in the ground state magnetic phase diagram. In fact a jump in the magnetization curve is observed. We found that, coupled spin-1/2 FM two-leg ladders are in a nonmagnetic phase at zero temperature. Applying a magnetic field, the ground state of coupled spin-1/2 FM two-leg ladders remains in the nonmagnetic phase up to a quantum saturate critical field.
Keywords
Cite
@article{arxiv.1507.04954,
title = {First-order commensurate-incommensurate magnetic phase transition in the coupled FM spin-1/2 two-leg ladders},
author = {J. Jahangiri and H. Hadipour and S. Mahdavifar and S. Farjami Shayesteh},
journal= {arXiv preprint arXiv:1507.04954},
year = {2015}
}