Partial disordered phase of Ising spin system in distorted triangular lattice RbCoBr3

Yoichi Nishiwaki, Tota Nakamura, Akira Oosawa, Kazuhisa Kakurai, Norikazu Todoroki, Naoki Igawa, Yoshinobu Ishii, Tetsuya Kato

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Powder and single-crystal neutron diffraction measurements were performed on RbCoBr3. The magnetic phase transitions of this compound are well explained by the Ising spin model for a distorted triangular lattice. Magnetic peaks of powder diffraction patterns at 34 and 20K closely fit a partial disordered phase and a ferrimagnetic phase, respectively. The temperature dependences of the (h, h, 1) scan profile and magnetic Bragg peak heights at (1, 1, 1), (1/3, 1/3, 1), and (2/3, 2/3, 1) were measured for a single-crystal sample. We conclude that the ferrimagnetic phase only exists below 30.5 K. The partial disordered phase is identified between 30.5 (= TN2) and 37.2K (= TN1). We found a characteristic linear increase in the (1, 1, 1) peak height below TN2 with decreasing temperature. These results show that a lattice distortion couples to the spin system. Numerical simulations are also performed to estimate magnetic interaction parameters.

Original languageEnglish
Article number104703
JournalJournal of the Physical Society of Japan
Volume77
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1

Keywords

  • Frustration
  • Ising spin
  • Lattice distortion
  • Neutron diffraction
  • Partial disordered phase
  • RbCoBr
  • Triangular lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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