Pressure-induced crossover from alternating to uniform interaction in a S = 1/2 one-dimensional Heisenberg antiferromagnet

M. Mito, T. Kawae, Y. Hosokoshi, K. Inoue, M. Kinoshita, K. Takeda

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We have confirmed the pressure-induced crossover from the alternating to the uniform interaction in a one-dimensional (1D) organic antiferromagnet by the measurement of heat capacity. The pentafluorophenyl nitroxide radical (F5PNN), which is a S = 1/2 1D Heisenberg antiferromagnet with the alternating interaction ratio α = |J2/J1|≈0.4(J1/kB = -3.1 K) at ambient pressure, has transformed into the uniform one (α = 1; J1/kB = -4.5 K) under the pressure of 6.5 kbar. This pressure-induced crossover was made clear by observing the change of low-temperature gradient of heat capacity, which gradually transformed from exponential to linear dependence on temperature, by the pressurization.

Original languageEnglish
Pages (from-to)607-611
Number of pages5
JournalSolid State Communications
Issue number11
Publication statusPublished - Aug 17 1999


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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