Spin-singlet ground state in the two-dimensional frustrated triangular lattice: YbAl3C3

Yoshiaki Kato, Masashi Kosaka, Hiromi Nowatari, Yuta Saiga, Atsushi Yamada, Takuya Kobiyama, Susumu Katano, Kenji Ohoyama, Hiroyuki S. Suzuki, Naofumi Aso, Kazuaki Iwasa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We present the highly frustrated phenomena observed in YbAl 3C3 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)LaNb2O 7 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 longrange magnetic order is suppressed by a large geometrical spin frustration, resulting in the stabilization of the dimer ground state.

Original languageEnglish
Article number053701
Journaljournal of the physical society of japan
Issue number5
Publication statusPublished - 2008 May
Externally publishedYes


  • Frustrated triangular lattice
  • Inelastic neutron scattering
  • Spin-singlet ground state

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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