Magnetoelastic couplings in the deformed kagome quantum spin lattice of volborthite

Akihiko Ikeda, Shunsuke Furukawa, Oleg Janson, Yasuhiro H. Matsuda, Shojiro Takeyama, Takeshi Yajima, Zenji Hiroi, Hajime Ishikawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Microscopic spin interactions on a deformed kagome lattice of volborthite are investigated through magnetoelastic couplings. A negative longitudinal magnetostriction ΔL/L<0 in the b axis is observed, which depends on the magnetization M with a peculiar relation of ΔL/L�M1.3. Based on the exchange striction model, it is argued that the negative magnetostriction originates from a pantographlike lattice change of the Cu-O-Cu chain in the b axis, and that the peculiar dependence arises from the local spin correlation. This idea is supported by DFT+U calculations simulating the lattice change and a finite-size calculation of the spin correlation, indicating that the recently proposed coupled-trimer model is a plausible one.

Original languageEnglish
Article number140412
JournalPhysical Review B
Volume99
Issue number14
DOIs
Publication statusPublished - 2019 Apr 29
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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