@article{oai:repo.qst.go.jp:00048942,
 author = {Hikihara, T. and Tonegawa, T. and Okamoto, K. and Sakai, T. and Sakai, Toru},
 issue = {5},
 journal = {Journal of the Physical Society of Japan},
 month = {May},
 note = {An S = 1/2 triangular-lattice Heisenberg antiferromagnet with next-nearest-neighbor (NNN) interactions is investigated under a magnetic field by the numerical-diagonalization method. It is known that, in both cases of weak and strong NNN 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 NNN interactions is varied. We find that a nonplateau region appears between the plateau phases in the cases of weak and strong NNN interactions.},
 pages = {054709-1--054709-8},
 title = {Exact Ground States of Frustrated Quantum Spin Systems Consisting of Spin-Dimer Units},
 volume = {86},
 year = {2017}
}