Observation of direct transitions in the ferromagnetic and antiferromagnetic dimer system (CH 3) 2NH 2CuCl 3 by high-field ESR

Makoto Yoshida, Yumiko Kitano, Yuji Inagaki, Takahiro Sakurai, Motoi Kimata, Susumu Okubo, Hitoshi Ohta, Keiichi Koyama, Mitsuhiro Motokawa, Takayuki Asano, Yoshitami Ajiro

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Abstract

High-field electron spin resonance (ESR) measurements of single crystals of (CH 3) 2NH 2CuCl 3 (DMACuCl 3) have been performed in the frequency range of 50 to 550 GHz in the paramagnetic region. In addition to the electron paramagnetic resonance, we have observed four ESR modes ω 1, ω 2, ω 3, and ω 4. The modes ω 2 and ω 3 have a frequency gap of 325 GHz (15.6 K), while the mode ω 1 has a gap of 420 GHz (20 K) at 0 T. The modes ω 2 and ω 3 are attributed to the transitions between the singlet and the triplet of the antiferromagnetic (AF) dimer. We found that the large spin-gap for the AF dimer still remains at the critical field B c2 = 3.5 T determined by magnetization and specific heat measurements.

Original languageEnglish
Article number113704
Journaljournal of the physical society of japan
Volume76
Issue number11
DOIs
Publication statusPublished - Nov 1 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Yoshida, M., Kitano, Y., Inagaki, Y., Sakurai, T., Kimata, M., Okubo, S., Ohta, H., Koyama, K., Motokawa, M., Asano, T., & Ajiro, Y. (2007). Observation of direct transitions in the ferromagnetic and antiferromagnetic dimer system (CH 3) 2NH 2CuCl 3 by high-field ESR. journal of the physical society of japan, 76(11), [113704]. https://doi.org/10.1143/JPSJ.76.113704