Magnetization "steps" on a kagome lattice in volborthite

Hiroyuki Yoshida, Yoshihiko Okamoto, Takashi Tayama, Toshiro Sakaktbara, Masashi Tokunaga, Akira Matsuo, Yasuo Narumi, Koichi Kindo, Makoto Yoshida, Masashi Takigawa, Zenji Hiroi

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Magnetic properties of the spin-1/2 kagome-like compound volborthite are studied using a highquality polycrystalline sample. It is evidenced from magnetization and specific heat measurements that the spins on the kagome lattice still fluctuate at low temperature, down to T - 60 mK that corresponds to 1/1500 of the nearest-neighbor antiferromagnetic interaction, exhibiting neither a conventional longrange order nor a spin gap. In contrast, 51 V NMR experiments revealed a sharp peak at 1 K in relaxation rate, which indicates that a certain exotic order occurs. Surprisingly, we have observed three "steps" in magnetization as a function of magnetic field, suggesting that at least four liquid-like or other quantum states exist under magnetic fields.

Original languageEnglish
Article number043704
Journaljournal of the physical society of japan
Volume78
Issue number4
DOIs
Publication statusPublished - 2009 Apr 1

Keywords

  • Kagome lattice
  • Magnetization step
  • Spin liquid
  • Volborthite

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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