Magnetic-field-induced freezing of spin correlations in networked system of 〔Mn4〕 single-molecule magnets

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  • Yamashita Satoshi
    Department of Chemistry, Graduate School of Science, Osaka University
  • Fujisaki Tatsuya
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Nakazawa Yasuhiro
    Department of Chemistry, Graduate School of Science, Osaka University CREST-JST, Honcho
  • Oguni Masaharu
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Nakata Kazuya
    Department of Chemistry, Graduate School of Science, Tohoku University
  • Yamashita Masahiro
    Department of Chemistry, Graduate School of Science, Tohoku University CREST-JST, Honcho
  • Miyasaka Hitoshi
    Department of Chemistry, Graduate School of Science, Tohoku University CREST-JST, Honcho

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タイトル別名
  • Magnetic-Field-Induced Freezing of Spin Correlations in Networked System of [Mn<SUB>4</SUB>] Single-Molecule Magnets
  • Magnetic field induced freezing of spin correlations in networked system of Mn4 single molecule magnets

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A low-temperature thermodynamic measurement of a single crystal of [Mn4(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 380 mK 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.

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