Neutron Diffraction Study of Successive Phase Transitions in the Heisenberg Antiferromagnet MnBr2

Taku Sato, Katsunori Iio, Hiroaki Kadowaki, Hiroji Masuda

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Neutron diffraction experiments on the Heisenberg antiferromagnet MnBr2 were performed to study the successive magnetic phase transitions (TN1 = 2.32 K, TN2 = 2.17 K). The magnetic structure in the intermediate phase is found to be a transverse sinusoidally-modulated structure with an incommensurate modulation vector qic ≃ (0.207, 0, 0.387), which varies as a function of temperature. At TN2 a first-order transition takes place from the incommensurate structure to the commensurate (qc=(l/4 0 1/4)) structure. These phase transitions are successfully accounted for using mean-field theory based on a Hamiltonian which consists of six exchange interactions and the dipole interaction.

Original languageEnglish
Pages (from-to)4583-4596
Number of pages14
Journaljournal of the physical society of japan
Volume63
Issue number12
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

Keywords

  • MnBr2
  • competing interactions
  • incommensurate spin structure
  • neutron diffraction
  • successive magnetic phase transitions
  • triangular lattice antiferromagnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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