Magnetism of a Two-Dimensional Weak-Ferromagnetic Organic Radical Crystal, 1,3,5-Triphenyl-6-Oxoverdazyl

Masaki Mito, Hiroyuki Nakano, Tatsuya Kawae, Masako Hitaka, Seishi Takagi, Hiroyuki Deguchi, Kentaro Suzuki, Kazuo Mukai, Kazuyoshi Takeda

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A genuine organic radical crystal 1,3,5-triphenyl-6-oxoverdazyl (TOV) has been revealed to be an S = 1/2 two-dimensional (2D) weak-ferromagnetic Heisenberg antiferromagnet with the exchange interaction 2J/kB = -9.0 K by the experiments of magnetic susceptibility, heat capacity, magnetization and electron paramagnetic resonance. The anomalous temperature dependence of the weak ferromagnetism at low temperatures is qualitatively explained by a four-sublattice model with two kinds of Dzyaloshinsky-Moriya (D-M) vectors of opposite sign on the ac-plane. The staggered susceptibility, which is a fictitious but intrinsic quantity for antiferromagnets, is estimated in TOV by making use of the canted weak ferromagnetic moments which dominate below 6 K. Especially the rapid growth of the magnetic susceptibility below 6 K is explained by the staggered susceptibility which makes the crossover effect from 2D Heisenberg to 2D Ising system, triggered by above the D-M anisotropy.

Original languageEnglish
Pages (from-to)2147-2156
Number of pages10
Journaljournal of the physical society of japan
Volume66
Issue number7
DOIs
Publication statusPublished - Jul 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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