Heat capacities of a networked system of single-molecule magnet with three-dimensional structure |
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| Authors: | S Yamashita K Hino Y Inoue Y Okada R Hirahara Y Nakazawa H Miyasaka M Yamashita |
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| Institution: | (1) Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;(2) Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aza-Aoba, Sendai 980-8578, Japan;(3) CREST-JST, Honcho, Kawaguchi, Saitama 332-0012, Japan |
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| Abstract: | A magnetic-fields dependence of heat capacity of Mn5(hmp)4(OH)2{N(CN)2}6]2MeCN·2THF (hmp=hydroxymethylpyridinate) is investigated by the thermal relaxation calorimetry technique. This compound is
a three-dimensional system consisting of Mn4 single-molecule magnet (SMM) units and Mn2+ ions, which are linked by the dicyanamide ligands to form a coordination network structure. A sharp peak of C
p being associated with the formation of three-dimensional long-range order is observed around 1.96 K. The thermodynamic discussion
based on the magnetic entropy suggests that both SMMs and Mn2+ ions are involved in the formation of the anitiferromagnetic spin ordering. However, this long-range ordering is very sensitive
to the external magnetic fields which work to change the magnitude of the Zeeman splitting of the SMM levels. The behavior
under magnetic fields is similar to that of the two-dimensional Mn4-network system studied previously. |
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| Keywords: | heat capacity Ising model relaxation calorimetry single-molecule magnet |
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