ESR measurements on one-dimensional quantum ferrimagnets A 3Cu3(PO4)4 with A = Sr and Ca in submillimeter-wave region

Shojiro Kimura, Hirofumi Ishikawa, Yuji Inagaki, Makoto Yoshida, Susumu Okubo, Hitoshi Ohta, Hiroyuki Nojiri, Alexei A. Belik, Masaki Azuma, Mikio Takano

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Abstract

We have performed high-frequency ESR measurements on powder and aligned samples of one-dimensional quantum ferrimagnets, A3Cu 3(PO4)4, with A = Sr and Ca. Large shifts of paramagnetic g-values were observed. We explain the observed g-shifts by means of an antiferromagnetic trimer model. Moreover, gradual increases of the linewidth of the ESR spectra are observed, indicating that a short-range correlation between the effective spins on the trimers begins to develop with decreasing temperature below 25 K. Analysis of the ESR signal, taking the local structures around Cu2+ ions into account, indicates quantum nature of A3Cu3(PO4)4 compounds.

Original languageEnglish
Article number094718
Journaljournal of the physical society of japan
Volume75
Issue number9
DOIs
Publication statusPublished - Sep 1 2006

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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