Two-Dimensional Coordination Networks of [Mn_4] Single-Molecule Magnets : Heat Capacity Measurements(Condensed matter : structure and mechanical and thermal properties)

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概要

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• 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 10K. 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 1T. 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.

• 社団法人日本物理学会の論文
• 2007-10-15

著者

• NAKAZAWA Yasuhiro

  Department of Chemistry, Graduate School of Science, Osaka University

• OGUNI Masaharu

  Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology

• Yamashita Masahiro

  Department Of Bioengineering Tokyo Institute Of Technology

• FUJISAKI Tatsuya

  Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences

• 山下 護

  徳島工短

• 山下 護

  Department Of Physics Engineering Faculty Of Engineering Mie University

• Fujisaki Tatsuya

  Department Of Chemistry Graduate School Of Science And Engineering Tokyo Institute Of Technology

• NAKATA Kazuya

  Department of Chemistry, Graduate School of Science, Tohoku University

• MIYASAKA Hitoshi

  Department of Chemistry, Graduate School of Science, Tohoku University

• LECREN Lollita

  Universite Bordeaux 1 ; CNRS, Centre de Recherche Paul Pascal

• Yamashita Makoto

  Department Of Applied Physics Osaka University

• Nakata Kazuya

  Department Of Chemistry Graduate School Of Science Tohoku University

• Miyasaka Hitosihi

  The Kansai Electric Power Co. Environmental Research Center

• Miyasaka Hitoshi

  Kansai Electric Power Co. Inc.

• Miyasaka Hitoshi

  Kansai Electric Power Co. Technical Research Center Environmental Research Center:rite Amagasakti 2n

• Yanagimoyo Masanobu

  Department Of Chemistry Faculty Of Science Ehime University

• Lecren Lollita

  Universite Bordeaux 1 ; Cnrs Centre De Recherche Paul Pascal

• Oguni Masaharu

  Department Of Chemistry Graduate School Of Science And Engineering Tokyo Institute Of Technology

• Oguni Masaharu

  Department Of Chemistry Faculty Of Science Tokyo Institute Of Technology

• Nakazawa Yasuhiro

  Department Of Chemistry Graduate School Of Science Osaka University:crest-jst

• Miyasaka Hitoshi

  Department Of Chemistry Faculty Of Science Tokyo Metropolitan University

• Miyasaka Hitoshi

  The Kansai Electric Power Co. Environmental Res. Center Keihanna-plaza 12f 1-7 Seikacho Sourakugun K

• Yamashita Masahiro

  Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University

• Miyasaka Hitoshi

  Department Of Chemistry Faculty Of Science Kyushu University

• Yamashita Masahiro

  Department Of Chemistry Faculty Of Science Tokyo Metropolitan University

• Miyasaka Hitoshi

  Department Of Chemistry Division Of Material Sciences Graduate School Of Natural Science And Technology

• YAMASHITA Mamoru

  Department of Applicad Physics, Faculty of Engineering Nagoya University

• Oguni Masaharu

  Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University

• Nakata Kazuya

  Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science

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