Magnetic-field-induced freezing of spin correlations in networked system of [Mn4] single-molecule magnets

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

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3 Citations (Scopus)


A low-temperature thermodynamic measurement of a single crystal of [Mn 4(hmp)4(pdm)2-{N(CN)2} 2](ClO4)2·1.75H2O· 2MeCN, which has a two-dimensional coordinating network consisting of Mn4 single-molecule magnets (SMMs), was performed by thermal relaxation calorimetry. Magnetic ordering was observed at an extremely low-temperature of 380mK at a zero field. We have found that the temperature dependence of heat capacity is strongly affected by applying weak magnetic fields owing to the large Zeeman effect occurring in the constituting SMM unit. When magnetic fields of 0.1- 0.3 T are applied, an abrupt decrease in heat capacity is observed at approximately 0.9 K, which phenomenologically resembles the glass formation of molecular or macromolecular systems. The delicate balance between the Zeeman effect in each unit and the cooperative character of a network produces such a nonequilibrium magnetic state in this material.

Original languageEnglish
Article number073708
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - 2008 Jul 1


  • Glass
  • Heat capacity
  • Phase transition
  • Single-molecule magnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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