Electron spin resonance in the quasi-two-dimensional triangular-lattice antiferromagnet Rb4Mn(MoO4)3

Hironori Yamaguchi, Shojiro Kimura, Rieko Ishii, Satoru Nakatsuji, Masayuki Hagiwara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We have performed electron spin resonance (ESR) measurements on single crystals of the newly synthesized Mn layered oxide Rb4Mn(MoO 4)3, in which Mn2+ ions with S = 5/2 form an equilateral triangular-lattice. The magnetic properties of this compound are reported to be well reproduced by theoretical calculations in a two-dimensional Heisenberg triangular-lattice antiferromagnet (2D HTAFM) with Ising anisotropy. The compound exhibits two successive phase transitions (TN1,T N2,TN1 <TN2) at zero-field. We have successfully explained the observed frequency dependence of the ESR resonance fields and the reported magnetization curves parallel and perpendicular to the easy-axis and the c-axis, at T< TN1 by mean-field approximation and a classical Monte Carlo simulation using a spin Hamiltonian of the 2D HTAFM with Ising anisotropy. Then, we have evaluated the anisotropy and exchange constants accurately. Consequently, we have confirmed that Rb 4Mn(MoO4)3 is a quasi-2D HTAFM with Ising anisotropy.

Original languageEnglish
Article number064705
Journaljournal of the physical society of japan
Volume80
Issue number6
DOIs
Publication statusPublished - 2011 Jun

Keywords

  • Magnetization
  • Multi-frequency ESR
  • Triangular-lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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