Magnetic-Field-Induced Freezing of Spin Correlations in Networked System of [Mn_4] Single-Molecule Magnets(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• A low-temperature thermodynamic measurement of a single crystal of [Mn_4(hmp)_4(pdm)_2-{N(CN)_2}_2](ClO_4)_2・1.75H_2O・2MeCN, which has a two-dimensional coordinating network consisting of Mn_4 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 0.9K, 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.

• 社団法人日本物理学会の論文
• 2008-07-15

著者

• NAKAZAWA Yasuhiro

  Department of Chemistry, Graduate School of Science, Osaka University

• YAMASHITA Satoshi

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

• 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

• 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

• 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

• Yamashita Satoshi

  Department Of Chemistry Graduate School Of Science Osaka University

• Miyasaka Hitoshi

  Department Of Chemistry Faculty Of Science Kyushu University

• Yamashita Satoshi

  Department Of Chemistry Graduate School Of Science Hokkaido University

• Yamashita Masahiro

  Department Of Chemistry Faculty Of Science Tokyo Metropolitan University

• Yamashita Satoshi

  Department Of Biochemistry And Engineering Graduate School Of Engineering Tohoku 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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