2017/08/24 by Hiroki Nakano, Toru Sakai
Physics and Astronomy · #cond-mat.str-el #cond-mat.stat-mech
paper · pdf · doi:10.7566/jpsj.86.114705
published as J. Phys. Soc. Jpn. 86, 114705 (2017) · 6pages, 7figures, to be published in J. Phys. Soc. Jpn
arxiv created 2017/08/24 · arxiv updated 2017/10/05
An S=1/2 triangular-lattice Heisenberg antiferromagnet with next-nearest-neighbor interactions is investigated under a magnetic field by the numerical-diagonalization method. It is known that, in both cases of weak and strong next-nearest-neighbor interactions, this system reveals a magnetization plateau at one-third of the saturated magnetization. We examine the stability of this magnetization plateau when the amplitude of next-nearest-neighbor interactions is varied. We find that a nonplateau region appears between the plateau phases in the cases of weak and strong next-nearest-neighbor interactions.