Heat capacities of a networked system of single-molecule magnet with three-dimensional structure

S. Yamashita; K. Hino; Y. Inoue; Y. Okada; R. Hirahara; Y. Nakazawa; H. Miyasaka; M. Yamashita

doi:10.1007/s10973-007-8967-x

Heat capacities of a networked system of single-molecule magnet with three-dimensional structure

S. Yamashita, K. Hino, Y. Inoue, Y. Okada, R. Hirahara, Y. Nakazawa, H. Miyasaka, M. Yamashita

IMR - Materials Development Division

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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 Mn ²⁺ 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.

Original language	English
Pages (from-to)	439-442
Number of pages	4
Journal	Journal of Thermal Analysis and Calorimetry
Volume	92
Issue number	2
DOIs	https://doi.org/10.1007/s10973-007-8967-x
Publication status	Published - 2008 May

Keywords

Heat capacity
Ising model
Relaxation calorimetry
Single-molecule magnet

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@article{3385a646f502413897bde61a075786e5,

title = "Heat capacities of a networked system of single-molecule magnet with three-dimensional structure",

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 Mn 2+ 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.",

keywords = "Heat capacity, Ising model, Relaxation calorimetry, Single-molecule magnet",

author = "S. Yamashita and K. Hino and Y. Inoue and Y. Okada and R. Hirahara and Y. Nakazawa and H. Miyasaka and M. Yamashita",

note = "Funding Information: This work was financially supported by CREST project, Japan Science and Technology Agency (JST). One of the authors YN thanks the Ikenaka Science and Technology Foundation for financial support.",

year = "2008",

month = may,

doi = "10.1007/s10973-007-8967-x",

language = "English",

volume = "92",

pages = "439--442",

journal = "Journal of Thermal Analysis and Calorimetry",

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publisher = "Springer Netherlands",

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TY - JOUR

T1 - Heat capacities of a networked system of single-molecule magnet with three-dimensional structure

AU - Yamashita, S.

AU - Hino, K.

AU - Inoue, Y.

AU - Okada, Y.

AU - Hirahara, R.

AU - Nakazawa, Y.

AU - Miyasaka, H.

AU - Yamashita, M.

N1 - Funding Information: This work was financially supported by CREST project, Japan Science and Technology Agency (JST). One of the authors YN thanks the Ikenaka Science and Technology Foundation for financial support.

PY - 2008/5

Y1 - 2008/5

N2 - 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 Mn 2+ 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.

AB - 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 Mn 2+ 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.

KW - Heat capacity

KW - Ising model

KW - Relaxation calorimetry

KW - Single-molecule magnet

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Heat capacities of a networked system of single-molecule magnet with three-dimensional structure

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