Two-dimensional coordination networks of [Mn 4] single-molecule magnets: Heat capacity measurements

Tatsuya Fujisaki, Yasuhiro Nakazawa, Masaharu Oguni, Kazuya Nakata, Masahiro Yamashita, Lollita Lecren, Hitoshi Miyasaka

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The magnetic-field dependences of heat capacities of two-dimensional (2D) network systems consisting of Mn 4 single-molecule magnets are studied at low temperatures between 0.6 and 10 K. Thermal anomalies associated with the formation of the antiferromagnetic order of large spins (S T = 9) mediated by the superexchange interactions are observed at 4.35K for [Mn 4(hmp) 6{N(CN) 2} 2](ClO 4) 2 (hmp - = 2-hydroxymethylpyridinate; N(CN) 2 - = dicyanamide) and 2.10K for [Mn 4(hmp) 4Br 2-(OMe) 2{N(CN) 2} 2]·2THF·0.5H 2O. They are suppressed by applying weak magnetic fields smaller than 1 T. In the case of [Mn 4(hmp) 4Br 2(OMe) 2{N(CN) 2} 2]·2THF·0.5H 2O, the entropy associated with the magnetic transition almost coincides with that of the ground-state doublet of S z = ±9. The coexistence of bulk-magnet characters and single-molecule magnet (SMM) characters in this network system gives an intrinsic peak broadening effect that resembles the finite-size effect in the magnetic nanoparticles.

Original languageEnglish
Article number104602
Journaljournal of the physical society of japan
Volume76
Issue number10
DOIs
Publication statusPublished - 2007 Oct 1

Keywords

  • Heat capacities
  • Phase transition
  • Single-molecule magnet
  • Two-dimensional network compounds

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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