Magnetic field versus temperature phase diagram of the spin-1/2 alternating-bond chain compound F 5PNN

Yasuo Yoshida, Tatsuya Kawae, Yuko Hosokoshi, Katsuya Inoue, Nobuya Maeshima, Kouichi Okunishi, Kiyomi Okamoto, Toru Sakai

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6 Citations (Scopus)

Abstract

We have measured the specific heat of the S - 1/2 alternating-bond Heisenberg antiferromagnetic chain compound pentafluorophenyl nitronyl nitroxide in magnetic fields using a single crystal and powder. A sharp peak due to field-induced magnetic ordering (FIMO) is observed in both samples. The H-T phase boundary of the FIMO of the single crystal is symmetric with respect to the central field of the gapless field region HC1< H whereas it is distorted for the powder whose ordering temperatures are lower. We discuss possibility that an effective pressure caused by mixing the powder with grease, which is reported for various organic compounds, plays an important role for the distorted phase boundary. An analysis employing calculations based on the finite temperature density matrix renormalization group suggests that the pressure-induced frustration enhances incommensurate spin correlation leading to the distorted phase boundary for the powder.

Original languageEnglish
Article number074716
Journaljournal of the physical society of japan
Volume78
Issue number7
DOIs
Publication statusPublished - Jul 1 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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