@article{oai:sucra.repo.nii.ac.jp:00013286,
 author = {Kato, Yoshiaki and 小坂, 昌史 and Nowatari, Hiromi and Saiga, Yuta and Yamada, Atsushi and Kobiyama, Takuya and 片野, 進 and Ohoyama, Kenji and Suzuki, Hiroyuki S. and Aso, Naofumi and Iwasa, Kazuaki},
 issue = {5},
 journal = {JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN},
 month = {},
 note = {http://jpsj.ipap.jp/link?JPSJ/77/053701/ | http://jpsj.ipap.jp/link?JPSJ/77/053701/, We present the highly frustrated phenomena observed in YbAl3C3 with a spin gap. The inelastic neutron spectra of low-lying magnetic excitations at low temperatures are quite similar to those of SrCU2(BO3)(2) and (CuCl)LaNb2O7 that exhibit a dimer ground state in a two-dimensional quantum spin system. The structure of the first excited triplet state is directly clarified by inelastic neutron scattering experiments with a higher energy resolution. Furthermore, it becomes clear that the characteristic magnetic excitations remain within a high-temperature region. The result of the specific heat measurement also shows an anomaly associated with the formation of dimerized Yb ions. We conclude that a long-range magnetic order is suppressed by a large geometrical spin frustration, resulting in the stabilization of the dimer ground state., text, application/pdf},
 pages = {053701-1--053701-4},
 title = {Spin-singlet ground state in the two-dimensional frustrated triangular lattice: YbAl3C3},
 volume = {77},
 year = {2008},
 yomi = {コサカ, マサシ and カタノ, ススム}
}