Specific heat study of an s = 1/2 alternating heisenberg chain system: F5PNN in a magnetic field

Y. Yoshida, N. Tateiwa, M. Mito, T. Kawae, K. Takeda, Y. Hosokoshi, K. Inoue

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Abstract

We have measured the specific heat of an S = 1/2 antiferromagnetic alternating Heisenberg chain pentafulorophenyl nitronyl nitroxide in magnetic fields up to H > HC2. This compound has a field-induced magnetic ordered (FIMO) phase between HC1 and HC2. Characteristic behaviors are observed depending on the magnetic field up to above H C2 outside of the H-T boundary for the FIMO. The temperature and field dependence of the specific heat are qualitatively in good agreement with the theoretical calculation on an S = 1/2 two-leg ladder [Wang et al., Phys. Rev. Lett. 84, 5399 (2000)]. This agreement suggests that the observed behaviors are related with the low-energy excitation in the Tomonaga-Luttinger liquid.

Original languageEnglish
Article number037203
JournalPhysical review letters
Volume94
Issue number3
DOIs
Publication statusPublished - Jan 28 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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