High-field ESR measurements of a bond alternating Heisenberg chain system Ni2(μ-N3)3(dpt)2(ClO4)

H. Ohta, S. Okubo, S. Kimura, S. Takeda, H. Kikuchi, H. Nagasawa

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

High-field electron spin resonance has been measured on a Ni2(μ-N3)3(dpt)2(ClO4) single crystal, which is an S = 1 Heisenberg antiferromagnet with bond alternation, in the frequency region from 50 to 370 GHz using pulsed magnetic fields up to 16 T. The g-values for H perpendicular and parallel to the single-crystal plane were determined to be 2.19 and 2.13, respectively. By analyzing our results on frequency dependence at 20 K by the simple dimer model considering the singlet and triplet states, we were able to determine the single-ion anisotropy of the system as |D| = 10.6 K and |E| = 3.1 K for the first time. The spin gap was estimated to be 93 K from the analysis of the temperature dependence of the integrated intensity. These results will be discussed in connection with other S = 1 Heisenberg antiferromagnets with bond alternation.

Original languageEnglish
Pages (from-to)55-59
Number of pages5
JournalPhysica B: Condensed Matter
Volume294-295
DOIs
Publication statusPublished - 2001 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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