A new manganese-based single-molecule magnet with a record-high antiferromagnetic phase transition temperature

doi:10.1088/1674-1056/23/6/067504

Abstract We perform both dc and ac magnetic measurements on the single crystal of Mn₃O(Et-sao)₃(ClO₄)(MeOH)₃ single-molecule magnet (SMM) when the sample is preserved in air for different durations. We find that, during the oxidation process, the sample develops into another SMM with a smaller anisotropy energy barrier and a stronger antiferromagnetic intermolecular exchange interaction. The antiferromagnetic transition temperature observed at 6.65 K in the new SMM is record-high for the antiferromagnetic phase transition in all the known SMMs. Compared to the original SMM, the only apparent change for the new SMM is that each molecule has lost three methyl groups as revealed by four-circle x-ray diffraction (XRD), which is thought to be the origin of the stronger antiferromagnetic intermolecular exchange interaction.

Keywords: single-molecule magnet quantum tunneling of magnetization antiferromagnetic intermolecular exchange interaction

Received: 27 March 2013
Revised: 03 April 2013
Accepted manuscript online:

PACS:	75.50.Xx	(Molecular magnets)
	76.60.Es	(Relaxation effects)
	75.30.Et	(Exchange and superexchange interactions)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

Fund: Project supported by the National Key Basic Research Program of China (Grant No. 2011CB921702) and the National Natural Science Foundation of China (Grant No. 11104331).

Corresponding Authors: Wang Yun-Ping
E-mail: ypwang@iphy.ac.cn

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Cui Yan (崔岩), Li Yan-Rong (李艳荣), Li Rui-Yuan (李瑞元), Wang Yun-Ping (王云平) A new manganese-based single-molecule magnet with a record-high antiferromagnetic phase transition temperature 2014 Chin. Phys. B 23 067504

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A new manganese-based single-molecule magnet with a record-high antiferromagnetic phase transition temperature

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